Hoses / Pipes / Sleeves

Air Intake Hose for Air Mass Meter

Fits:
Porsche 924 S 1986-88
Porsche 944 1982-85
Porsche 944.2 2.5L 1985-88 (not turbo)
Porsche 944.2 2.7L 1988-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 6

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94411035804

The product you are viewing cross references to these numbers

Breather Hose - 15 x 2.5mm 
Sold by the metre

High-quality breather hose with 15 x 2.5mm dimensions, designed for Porsche 924, 924S, and 944 models.

This versatile hose is used across multiple systems, including fuel tank breather, oil breather, and inlet breather applications, making it an essential component for maintaining proper ventilation and pressure balance within the engine and fuel systems.

Fits:

• Porsche 924 2.0L 1976-79
• Porsche 924 2.0L 1980-85
• Porsche 924 Turbo 2.0L 1979-81
• Porsche 924 Turbo 2.0L 1982-84
• Porsche 924 Carrera GT 2.0L 1981
• Porsche 924 Carrera GTS 2.0L 1982
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-85

Diagram ref no 6 

Engineered to OEM specifications, this hose offers durability, flexibility, and resistance to heat, oil, and fuel vapours, ensuring reliable performance in demanding engine bay environments. Ideal for maintenance, repair, or restoration of classic Porsche models.

Key Features

• 15 x 2.5mm breather hose specification
• Suitable for Porsche 924, 924S, and 944
• Part number N0203631
• Multi-use: fuel tank, oil, and inlet breather systems
• Resistant to heat, oil, and fuel vapours
• Flexible and durable construction
• OEM-style fit and performance

Function and Purpose

This breather hose serves multiple ventilation roles across the vehicle.

It helps to:
• Vent fuel tank vapours safely
• Regulate pressure in oil breather systems
• Maintain airflow within inlet systems
• Prevent pressure build-up in critical components
• Support efficient engine and fuel system operation

Why Replace Breather Hoses

Breather hoses are exposed to heat, oil, and vapours, leading to wear over time.

Common issues include:
• Cracking or splitting
• Oil or vapour leaks
• Hardening and loss of flexibility
• Reduced ventilation efficiency

Replacing worn hoses ensures proper system balance and prevents performance issues.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

N0203631

The product you are viewing cross references to these numbers

Clamp 17x15 – Inlet Manifold & Power Steering Hose Clamp 
Sold each

High-quality 17x15 clamp designed for securing hoses on Porsche 911, 964, 993, and 944 models.

This clamp is used for inlet manifold air hoses on Porsche 911, 964, and 993 models, as well as power steering hoses on the Porsche 944, ensuring correct routing and secure mounting across critical systems.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 944 2.5L 8V 1985-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988

Diagram ref no 23

Manufactured to OEM specifications, this clamp provides durability, corrosion resistance, and precise fitment. Supplied individually, it is ideal for maintenance, repair, or restoration of Porsche intake and steering systems.

Key Features

• Clamp size 17x15
• Suitable for Porsche 911, 964, 993, and 944
• Part number 99951242802
• Used for inlet manifold and power steering hose applications
• Ensures secure hose mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure hoses across multiple systems.

It helps to:
• Hold inlet manifold air hoses securely in place
• Maintain correct routing of power steering hoses
• Prevent hose movement and vibration damage
• Support stable airflow and steering system performance
• Ensure long-term system reliability

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Hose movement or disconnection
• Increased risk of leaks or performance issues

Replacing worn clamps ensures secure installation and protects critical systems.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951242802

The product you are viewing cross references to these numbers

Clamp 17x15 – Inlet Manifold & Power Steering Hose Clamp 
Sold each

High-quality 17x15 clamp designed for securing hoses on Porsche 911, 964, 993, and 944 models.

This clamp is used for inlet manifold air hoses on Porsche 911, 964, and 993 models, as well as power steering hoses on the Porsche 944, ensuring correct routing and secure mounting across critical systems.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 944 2.5L 8V 1985-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988

Diagram ref no 23

Manufactured to OEM specifications, this clamp provides durability, corrosion resistance, and precise fitment. Supplied individually, it is ideal for maintenance, repair, or restoration of Porsche intake and steering systems.

Key Features

• Clamp size 17x15
• Suitable for Porsche 911, 964, 993, and 944
• Part number 99951242802
• Used for inlet manifold and power steering hose applications
• Ensures secure hose mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure hoses across multiple systems.

It helps to:
• Hold inlet manifold air hoses securely in place
• Maintain correct routing of power steering hoses
• Prevent hose movement and vibration damage
• Support stable airflow and steering system performance
• Ensure long-term system reliability

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Hose movement or disconnection
• Increased risk of leaks or performance issues

Replacing worn clamps ensures secure installation and protects critical systems.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951242802

The product you are viewing cross references to these numbers

Clamp  D1 20x15   – Multi-Position Clamp 

High-quality D1 20x15 clamp designed for securing various components across Porsche 924S, 944, 928, 964, and 993 models.

This versatile clamp is used in multiple applications including bonnet release cables (924S / 944), expansion tank hoses (944), engine wiring loom (928 S4), injection vacuum hoses (964), and brake reservoir connections (993).

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 24  

Manufactured to OEM specifications, this clamp ensures secure fitment, durability, and resistance to corrosion. Supplied individually, it is ideal for maintenance, repair, or restoration across multiple Porsche systems.

Key Features

• Clamp size D1 20x15
• Suitable for Porsche 964S, 944, 928, 964, and 993
• Part number 99951117701
• Multi-use: cables, hoses, wiring looms, vacuum lines
• Ensures secure mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure a wide range of components.

It helps to:
• Hold cables, hoses, and wiring looms in place
• Maintain correct routing and alignment
• Prevent vibration-related wear or damage
• Protect sensitive systems such as wiring and vacuum lines
• Ensure long-term reliability across multiple systems

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of hoses, cables, or wiring
• Increased risk of system wear or failure

Replacing worn clamps ensures proper securing and protects critical components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951117701

The product you are viewing cross references to these numbers

Clamp  D1 20x15   – Multi-Position Clamp 

High-quality D1 20x15 clamp designed for securing various components across Porsche 924S, 944, 928, 964, and 993 models.

This versatile clamp is used in multiple applications including bonnet release cables (924S / 944), expansion tank hoses (944), engine wiring loom (928 S4), injection vacuum hoses (964), and brake reservoir connections (993).

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 24  

Manufactured to OEM specifications, this clamp ensures secure fitment, durability, and resistance to corrosion. Supplied individually, it is ideal for maintenance, repair, or restoration across multiple Porsche systems.

Key Features

• Clamp size D1 20x15
• Suitable for Porsche 964S, 944, 928, 964, and 993
• Part number 99951117701
• Multi-use: cables, hoses, wiring looms, vacuum lines
• Ensures secure mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure a wide range of components.

It helps to:
• Hold cables, hoses, and wiring looms in place
• Maintain correct routing and alignment
• Prevent vibration-related wear or damage
• Protect sensitive systems such as wiring and vacuum lines
• Ensure long-term reliability across multiple systems

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of hoses, cables, or wiring
• Increased risk of system wear or failure

Replacing worn clamps ensures proper securing and protects critical components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951117701

The product you are viewing cross references to these numbers

Connecting hose for air cleaner box.

Fits:
Porsche 944 S 2.5L 1987-88

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94411001480

The product you are viewing cross references to these numbers

Vacuum Hose Distribution Y-Piece – 4mm Vacuum Line Splitter 
Sold each - used in various locations

High-quality vacuum hose distribution Y-piece designed for a wide range of Porsche models including 911, 964, 924S, 944, 968, and 928.

This Y-splitter allows a single vacuum source to be divided into two outlets, enabling efficient routing and connection of vacuum lines within the engine bay or HVAC system. It is specifically designed for vacuum hoses with a 4mm outer diameter, ensuring a secure and precise fit.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94
• Porsche 928S2 4.7L 1984-86

Diagram ref no 4

Manufactured to OEM standards, this connector is ideal for maintaining or restoring vacuum system integrity across multiple Porsche applications.

Key Features

• Universal-style vacuum Y-piece connector
• Suitable for Porsche 911, 964, 924S, 944, 968, and 928
• Designed for 4mm outer diameter vacuum hoses
• Enables splitting of vacuum lines
• OEM-style fit and function
• Durable construction for long-term reliability

Function and Purpose

This Y-piece is a critical connector within the vacuum system.

It helps to:

• Split a single vacuum line into two outputs
• Maintain proper vacuum routing
• Ensure consistent vacuum pressure distribution
• Support engine and HVAC system operation

Why Replace Your Vacuum Connector

Over time, vacuum connectors can degrade due to heat and age.

Common issues include:

• Cracked or brittle plastic
• Vacuum leaks
• Poor hose connections
• Engine or HVAC system malfunctions

Replacing the Y-piece restores proper vacuum system function.

• Loose or unsecured temperature sensor
• Incorrect temperature readings
• HVAC system inconsistencies
• Broken or missing connector clips

Replacing the lock piece restores proper sensor stability and function.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92857372702

The product you are viewing cross references to these numbers

Vacuum Hose Distribution Y-Piece – 4mm Vacuum Line Splitter 
Sold each - used in various locations

High-quality vacuum hose distribution Y-piece designed for a wide range of Porsche models including 911, 964, 924S, 944, 968, and 928.

This Y-splitter allows a single vacuum source to be divided into two outlets, enabling efficient routing and connection of vacuum lines within the engine bay or HVAC system. It is specifically designed for vacuum hoses with a 4mm outer diameter, ensuring a secure and precise fit.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 968 3.0L 1992-94
• Porsche 968 Sport 3.0L 1994-95
• Porsche 968 CS 3.0L 1993-95
• Porsche 968 Turbo S 3.0L 1993-94
• Porsche 928S2 4.7L 1984-86

Diagram ref no 4

Manufactured to OEM standards, this connector is ideal for maintaining or restoring vacuum system integrity across multiple Porsche applications.

Key Features

• Universal-style vacuum Y-piece connector
• Suitable for Porsche 911, 964, 924S, 944, 968, and 928
• Designed for 4mm outer diameter vacuum hoses
• Enables splitting of vacuum lines
• OEM-style fit and function
• Durable construction for long-term reliability

Function and Purpose

This Y-piece is a critical connector within the vacuum system.

It helps to:

• Split a single vacuum line into two outputs
• Maintain proper vacuum routing
• Ensure consistent vacuum pressure distribution
• Support engine and HVAC system operation

Why Replace Your Vacuum Connector

Over time, vacuum connectors can degrade due to heat and age.

Common issues include:

• Cracked or brittle plastic
• Vacuum leaks
• Poor hose connections
• Engine or HVAC system malfunctions

Replacing the Y-piece restores proper vacuum system function.

• Loose or unsecured temperature sensor
• Incorrect temperature readings
• HVAC system inconsistencies
• Broken or missing connector clips

Replacing the lock piece restores proper sensor stability and function.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92857372702

The product you are viewing cross references to these numbers

Hose clamp, 12-22 mm - Various Applications.

Fits:
Porsche 928 - 1978 to 1986
Porsche 924 - 1976 to 1986
Porsche 924S - 1986 to 1988
Porsche 944 - 1982 to 1991
Porsche 968 - 1992 to 1995



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951255400

The product you are viewing cross references to these numbers

Hose. 
The Genuine Porsche Air / Vacuum Hose (Part Number: 94411017802) is an original equipment engine intake system component designed for early Porsche 944 2.5L models equipped with factory air conditioning.

Fits:

• Porsche 944 2.5L 8V 1982-87

Diagram Ref No 29

This hose forms part of the engine's auxiliary air and vacuum system, working in conjunction with the electrically operated auxiliary air valve and associated intake components to maintain the intended air passages within the engine management system.

Manufactured to Porsche's original fitment specifications, the hose is designed to provide a secure, correctly routed connection between the relevant intake and auxiliary air components. Its moulded shape helps ensure correct positioning within the engine compartment while maintaining a properly sealed air passage.

The Porsche 944's 2.5L four-cylinder engine depends on correctly managed intake airflow to maintain stable idling, smooth engine operation and reliable performance. A damaged or leaking hose may allow unmetered air to enter the intake system, potentially affecting the air-fuel mixture and idle quality.

Over time, original rubber hoses can deteriorate as a result of engine heat, age, vibration and repeated thermal cycling. Rubber may become hard, brittle or cracked, particularly around connection points and hose bends.

A split or poorly sealed hose may cause an intake air leak, leading to rough idling, fluctuating engine speed or reduced drivability.

Replacing a deteriorated hose with a Genuine Porsche replacement helps restore the original intake system sealing arrangement, maintain correct auxiliary air operation and preserve the reliability of the engine's air management system.

Ideal for intake leak repairs, idle quality investigations, routine engine maintenance and classic Porsche restoration projects, this hose provides a factory-specified replacement for compatible early Porsche 944 models.

What This Product Does:
The Porsche 944 Air / Vacuum Hose is part of the engine's auxiliary air and intake system.

Its primary function is to provide a sealed air passage between the relevant intake components, supporting the operation of the electrically controlled auxiliary air valve.

The auxiliary air system helps manage additional airflow under certain operating conditions. The hose must remain correctly connected and airtight to ensure the system functions as intended.

If the hose becomes cracked, loose or disconnected, unwanted air may enter the intake system and interfere with the engine's normal fuel and air management.

Its main functions include:

• Providing an auxiliary air passage: Connects the relevant components within the engine's auxiliary air system.
• Maintaining intake system sealing: Helps prevent unwanted air from entering through damaged or poorly sealed connections.
• Supporting stable engine idling: Helps maintain the airflow conditions needed for consistent idle operation.
• Supporting auxiliary air valve operation: Provides the appropriate hose connection for the electrically controlled auxiliary air arrangement.
• Maintaining correct air-fuel management: Helps prevent air leaks that could disturb the intended engine mixture.
• Supporting smooth engine performance: Reduces the likelihood of running problems associated with an air leak.
• Providing correct component routing: Uses the original hose shape to maintain the intended installation arrangement.
• Preserving factory functionality: Maintains the original Porsche intake system configuration.

Symptoms Of Wear Or Failure:
The original Porsche 944 air and vacuum hoses are exposed to engine heat, vibration, oil vapour and age-related deterioration.

On older vehicles, rubber components may lose flexibility, crack or become loose around their connections.

Common symptoms of a worn or damaged hose include:

• Rough engine idling: An intake air leak may disturb the air-fuel mixture, causing uneven engine operation.
• Fluctuating idle speed: The engine speed may rise and fall unexpectedly when the hose no longer seals correctly.
• High idle speed: Unmetered air entering the intake system may contribute to an abnormally high idle.
• Engine stalling: Severe air leaks may affect idle stability, particularly at low engine speeds.
• Hissing noises: A split or disconnected hose may produce an audible air leak around the intake system.
• Hard or brittle rubber: Ageing can cause the hose to lose flexibility and become more susceptible to cracking.
• Visible splits or cracks: Damage may appear around bends, hose ends or clamping areas.
• Loose hose connections: Deteriorated hose ends may no longer grip their fittings securely.
• Poor engine response: Intake air leaks may contribute to hesitation or inconsistent engine operation.
• Increased fuel consumption: Incorrect air-fuel management caused by significant air leaks may affect fuel efficiency.
• Cold-running irregularities: A fault in the auxiliary air circuit may contribute to unstable operation during warm-up.
• Damaged or collapsed hose sections: Physical deterioration may restrict the intended passage or prevent proper sealing.

Why Replacement Matters:
Replacing an ageing or damaged air hose is important for maintaining the integrity of the Porsche 944's intake system and supporting reliable engine performance.

Even small cracks or poorly sealed connections can allow unwanted air to enter the intake system, particularly when the engine is idling.

A damaged hose may also become increasingly brittle over time, making it more likely to split during engine servicing or normal operation.

Installing a Genuine Porsche replacement Air / Vacuum Hose helps to:

• Restore correct intake sealing: Replace damaged hose material and reduce unwanted air leakage.
• Improve idle stability: Help restore consistent engine idling where a leaking hose is contributing to irregular running.
• Maintain correct auxiliary air operation: Ensure the relevant air circuit is connected and sealed as intended.
• Reduce unmetered air entry: Help preserve the correct relationship between intake airflow and fuel delivery.
• Address hissing noises: Eliminate air leak sounds caused by a confirmed damaged hose.
• Improve engine drivability: Help restore smoother low-speed operation where an intake leak is responsible.
• Prevent further deterioration: Replace hardened, cracked or brittle rubber before complete failure.
• Maintain correct hose routing: Restore the original fitment and connection arrangement.
• Support engine servicing: Provide replacement pipework during auxiliary air valve or intake maintenance.
• Preserve vehicle originality: Maintain the factory intake system configuration on early Porsche 944 models.
• Support classic Porsche restoration: Replace deteriorated rubber components during comprehensive engine refurbishment.
• Maintain Genuine Porsche specifications: Use the original replacement reference intended for the applicable vehicle.

Replacement is particularly recommended when the original hose shows visible cracking, hardening, loose connections or confirmed air leakage.

When carrying out intake system maintenance, inspecting neighbouring hoses and rubber connections is advisable because these components often experience similar age-related deterioration.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94411017802

The product you are viewing cross references to these numbers

Hose.
The Porsche Hose is a replacement air hose for the turbocharger bypass and intake air control system fitted to selected Porsche 944 Turbo (951) models.

Fits:

• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988

  
Diagram Ref No 18

This hose provides a flexible, sealed connection between the turbocharger bypass valve, also referred to as the turbo cut-off valve or recirculation valve, and the associated rigid intake pipework.

The Porsche 944 Turbo uses a forced-induction system in which the turbocharger compresses intake air to improve engine performance.

To maintain stable operation, the intake system incorporates a bypass valve that helps manage pressure when the throttle is closed, particularly after acceleration.

The 95111051100 hose forms part of the plumbing associated with this valve.

Its flexible construction accommodates the connection between adjoining components while helping maintain the intended air seal.

A secure connection is important because leaks within the turbocharger intake and recirculation system can interfere with pressure management and engine operation.

Over time, the original hose may become hard, brittle or cracked due to age, heat, oil vapour and repeated thermal cycling.

The hose ends may also deteriorate around their clamps, allowing air to escape or enter through an unintended path.

Damage can be difficult to identify because small cracks may form on the underside of the hose or become more apparent only when it is flexed.

A defective hose may contribute to unstable idle, reduced boost response, inconsistent engine performance or unusual air-leak noises, depending on the location and severity of the leak.

Replacing a worn hose helps restore a properly sealed connection within the turbocharger bypass system.

This component is particularly relevant to maintenance and restoration of the Porsche 944 Turbo, where original rubber intake hoses may have deteriorated after several decades of use.

Suitable for repairs to the turbocharger bypass valve plumbing, diagnosis of intake air leaks and refurbishment of the original engine intake arrangement.

What This Product Does:
The hose connects the turbocharger bypass/shut-off valve to its associated rigid intake pipework.

The bypass valve is used to manage pressure within the turbocharged intake system when operating conditions change.

During acceleration, the turbocharger supplies compressed air to the engine.

When the driver releases the accelerator and the throttle closes, pressure conditions within the intake system change rapidly.

The bypass valve provides a controlled route for air recirculation, helping reduce compressor surge and maintain stable turbocharger operation.

The 95111051100 hose provides one of the sealed connections required for this arrangement.

Its main functions include:

• Connecting the bypass valve: Links the turbocharger cut-off valve to the corresponding rigid pipework.
• Maintaining an airtight connection: Helps prevent unintended air leakage within the intake system.
• Supporting pressure recirculation: Allows the bypass valve plumbing to operate as designed.
• Supporting turbocharger response: Helps maintain proper pressure management when the throttle position changes.
• Accommodating movement: Provides a flexible connection between adjoining intake components.
• Maintaining intake integrity: Helps preserve the original arrangement of hoses, valves and connecting pipes.
• Reducing unwanted air leaks: Maintains the intended sealed path when correctly installed.
• Supporting stable engine operation: Helps avoid symptoms associated with defective intake plumbing.
• Maintaining original vehicle configuration: Provides a replacement for the relevant Porsche 944 Turbo connection.

Symptoms Of Wear Or Failure:
The original hose is exposed to engine heat, vibration, oil vapour and repeated changes in pressure.

Ageing rubber can harden, lose flexibility or develop cracks.

Common symptoms of a worn or damaged hose include:

• Visible cracking: Small splits may develop along the hose body or around its ends.
• Hardened rubber: The original material may become stiff and less able to seal.
• Brittle hose ends: The hose may crack when disturbed during servicing.
• Loose connections: Deteriorated material may no longer seal securely beneath the clamps.
• Air leakage: Cracks or loose joints can allow unintended airflow.
• Hissing noises: A leak may produce an audible air sound during operation.
• Inconsistent boost response: Leakage within the intake control system may affect pressure behaviour.
• Reduced engine performance: A significant leak may contribute to poor engine response.
• Unstable idle: Certain intake air leaks can disturb idle quality.
• Hesitation during acceleration: Incorrect airflow or pressure management may contribute to hesitation.
• Rough engine running: Air leaks may affect the intended air and fuel mixture.
• Poor throttle response: A compromised intake seal may contribute to delayed or inconsistent response.
• Oil contamination: Oil vapour deposits may accelerate rubber deterioration.
• Swollen or softened rubber: Exposure to oil and heat may affect the hose material.
• Damaged retaining clamps: Loose or corroded clamps can prevent secure attachment.
• Hose displacement: An incorrectly secured hose may move away from its connection.
• Previous temporary repairs: Tape or unsuitable substitute tubing may indicate a deteriorated original hose.

Why Replacement Matters:
Replacing a deteriorated turbo bypass valve hose helps restore the intended connection within the Porsche 944 Turbo intake system.

1. Restore an Airtight Connection

A cracked or hardened hose may allow air leakage at the bypass valve connection.

A correctly fitted replacement restores the required seal.

2. Support Proper Turbocharger Pressure Management

The bypass valve relies on intact connecting hoses to operate as intended.

Replacing a damaged hose helps maintain the proper recirculation arrangement.

3. Address Intake Air Leaks

Unintended air movement within the intake system can affect engine operation.

A replacement hose helps eliminate one possible source of leakage.

4. Improve Consistency of Engine Operation

Where a defective hose is responsible for an air leak, replacement may help restore smoother running and more consistent response.

It will not correct unrelated engine-management or turbocharger faults.

5. Replace Ageing Rubber

The original Porsche 944 Turbo hose may have been exposed to decades of high temperatures and engine vibration.

Even if no major leak is visible, rubber that has become brittle or cracked should be renewed.

6. Reduce the Risk of Hose Disconnection

Damaged hose ends can lose their grip on adjoining pipework.

Replacing the hose and ensuring correct clamp tension helps maintain secure attachment.

7. Support Classic Porsche Restoration

A correctly specified hose helps restore the original intake plumbing during engine-bay refurbishment.

8. Complement Bypass Valve Servicing

When repairing or replacing the turbocharger shut-off valve, it is sensible to inspect the adjoining hose and clamps.

Replacing a deteriorated hose during the same repair may reduce the need for further dismantling.

9. Prevent Further Deterioration

Small cracks can increase as the hose is exposed to additional heat and movement.

Replacement before complete failure helps maintain the integrity of the system.

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