Seal ring Genuine Porsche part 99311072340

Intake manifold.
Fits:
Porsche 993 C2 / C4 1994-98
Porsche 993 Turbo
Click 'Zoom in' for large parts diagram.
Diagram ref no 12.

Related reference numbers
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99311071250

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Intake manifold gasket. Sold each.
Fits:
Porsche 964 1989-94
Porsche 993 1995-98
This product supersedes Porsche's old part numbers:
- 96411071300
- 96411071301
Click 'Zoom in' for large parts diagram.
Diagram ref no 13

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Related, superseded, cross reference or alternative numbers for comparison.

99311071301

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Intake Manifold.

The OE MATCH Intake Manifold (Part Number 99311071250/1) is a high-quality replacement component designed to restore efficient airflow and reliable engine operation on Porsche 911 (993) Carrera 2, Carrera 4 and Turbo models.

Fits:

• Porsche 993 C2 / C4 1994-98
• Porsche 993 Turbo

Diagram Ref No 12

Manufactured to match the original equipment specifications, this intake manifold component forms an important part of the engine's air induction system, helping deliver the required airflow towards the engine's combustion chambers.

The Porsche 993's six-cylinder boxer engine relies on a properly sealed intake system to maintain efficient combustion, consistent throttle response and smooth engine performance. Each intake runner provides a passage for air to travel through the induction system, helping support the engine's intended operating characteristics.

Over time, original intake manifold components can become damaged through heat exposure, engine vibration, ageing and repeated maintenance. Cracks, damaged mounting surfaces or deteriorated connecting sleeves can allow unwanted air to enter the intake system, potentially affecting engine performance and efficiency.

A leaking or damaged intake manifold connection may contribute to rough idling, hesitation during acceleration, reduced engine responsiveness and irregular combustion.

The OE MATCH Intake Manifold provides a practical replacement for a damaged original component, helping restore the correct airflow passage, maintain the integrity of the intake system and preserve the factory engine configuration.

Ideal for Porsche 993 engine maintenance, intake system repairs, air leak diagnosis and classic Porsche restoration projects.

What This Product Does:
The intake manifold is a vital part of the engine's air induction system, responsible for directing air towards the engine cylinders.

Its primary functions include:

• Directs Intake Air: Provides a passage for air to travel through the intake system towards the engine's intake ports.
• Supports Efficient Combustion: Helps deliver the air required for the correct combustion process.
• Maintains Intake System Integrity: Works with the associated rubber sleeves, seals and mounting components to maintain a properly sealed induction system.
• Supports Smooth Engine Operation: Helps maintain consistent airflow for stable idling and normal engine running.
• Maintains Throttle Response: Supports the engine's ability to respond smoothly to changes in throttle demand.
• Reduces Unmetered Air Entry: Correct sealing helps prevent air from entering the system through unintended openings.
• Supports Engine Efficiency: Helps maintain the intended intake arrangement for correct air delivery and combustion.
• Maintains Cylinder Air Supply: Forms part of the individual air intake path serving the engine's six-cylinder configuration.
• Supports Original Engine Performance: Preserves the factory-style intake passage and installation geometry.
• Maintains Original Equipment Fitment: Designed to replace the corresponding factory intake manifold component.

Symptoms Of Wear Or Failure:
The intake manifold and its associated connections are subjected to engine heat, vibration and continuous airflow throughout their service life.

While the manifold runner itself is generally durable, physical damage, ageing seals or deteriorated connecting components can lead to intake air leaks and engine operating problems.

Common symptoms include:

• Rough or Unstable Idle: Unmetered air entering the intake system may cause the engine to idle unevenly.
• Engine Hesitation: Air leaks may contribute to hesitation or inconsistent response during acceleration.
• Reduced Engine Performance: A damaged or leaking intake connection may affect the engine's normal operating characteristics.
• Visible Cracks or Fractures: Physical damage to the manifold may allow air to escape or enter through an unintended opening.
• Intake Air Leaks: Damaged mounting surfaces, seals or connecting sleeves may allow unwanted air into the induction system.
• Hissing or Whistling Noises: Air leaking through a cracked manifold or deteriorated connection may produce noticeable intake noises.
• Irregular Engine Running: Inconsistent intake airflow may contribute to uneven combustion or running quality.
• Increased Fuel Consumption: Intake air leaks may affect engine management corrections and contribute to inefficient operation.
• Engine Management Warning Light: Certain intake-related faults may trigger diagnostic warnings or stored fault codes.
• Damaged Mounting Points: Cracked or distorted mounting areas may prevent the manifold from being securely installed.
• Loose or Deteriorated Rubber Sleeves: Ageing connecting sleeves can lose flexibility, split or allow unwanted air leakage.
• Visible Damage Following Repairs: Incorrect removal, overtightening or accidental impact may damage the original manifold.

Why Replacement Matters:
Replacing a cracked, damaged or leaking intake manifold helps maintain the correct operation and reliability of the Porsche 993's engine air induction system.

Key Benefits of Replacement:

• Restores Correct Intake Airflow: Replaces damaged components to help maintain the intended passage of air towards the engine.
• Helps Eliminate Intake Air Leaks: Restores sealing integrity where the original manifold or its mounting surfaces are damaged.
• Supports Smooth Engine Idling: Helps reduce running irregularities caused by confirmed intake leaks.
• Improves Engine Responsiveness: Restoring the correct intake arrangement can help recover normal throttle response where leakage was affecting performance.
• Maintains Efficient Combustion: Helps preserve the intended air delivery characteristics of the engine.
• Reduces Unmetered Air Entry: Supports correct airflow measurement and engine management operation.
• Protects Engine Reliability: Helps prevent continued operation with an unresolved intake system defect.
• Maintains Factory Specifications: Designed to match the original Porsche intake manifold arrangement.
• Original Equipment-Style Fitment: Provides the appropriate replacement shape and connections for compatible engines.
• Supports Long-Term Engine Performance: Helps preserve normal engine operation by maintaining the integrity of the induction system.
• Ideal During Engine Maintenance: Suitable for replacement during intake system refurbishment or when repairing damaged components.
• Cost-Effective Repair: Allows an individual damaged runner to be replaced without necessarily renewing the entire intake assembly.
• Suitable for Classic Porsche Restoration: Helps maintain the original appearance and configuration of the Porsche 993 engine.

A damaged intake manifold may initially cause only a minor air leak or occasional running irregularity. However, continued operation with an intake leak can result in inconsistent air-fuel mixture control and reduced engine performance.

Replacing a defective runner with an OE MATCH component helps restore the intended intake system configuration and supports reliable engine operation.

Where the original rubber connecting sleeves have hardened, cracked or deteriorated, these should also be inspected and replaced as necessary to ensure the intake system is correctly sealed.

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

99311071250

The product you are viewing cross references to these numbers

Intake manifold gasket.
Fits:
Porsche 964 1989-94
Porsche 993 1995-98
This product supersedes Porsche's old part numbers:
- 96411071300
- 96411071301
Click 'Zoom in' for large parts diagram.
Diagram ref no 13

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

99311071301

The product you are viewing cross references to these numbers

Air intake manifold billet aluminium - Set of 6
Comes complete with manifold gaskets
Fits:
Porsche 964 - 1989 to 1993
Porsche 993 - 1994 to 1998
For use with the standard 964/993 inlet manifolds and 3 bolt manifolds

Product Details:
Replace your aging plastic intake runners on the Porsche 964/993 with meticulously 3D milled billet versions in aircraft aluminum, offering durability and aesthetic enhancement.

Enhanced Specifications:
Available in head diameters of 41.5mm or 42.5mm, paired with standard injector sizes. 

Flexible Compatibility and Configurations:
Compatible with standard rails 

Important Note:
To ensure effective heat insulation, this product requires a flat cylinder head seal, offering better performance compared to the usual seal type.
Supplied with reinforced high thermal plastic gaskets for thermal insulation

Craftsmanship and Finish:
Featuring a natural machined finish, these runners are equipped with a base gasket insulator for 

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

99311071250

The product you are viewing cross references to these numbers

Air intake manifold 964/993 to GT3, billet aluminium - Set of 6
Comes complete with thermal insulating manifold gaskets
Fits:
Porsche 964 - 1989 to 1993
Porsche 993 - 1994 to 1998

Tailored for GT3 Type Intakes:
Specially designed to fit GT3  intake manifolds (with built-in offsets) perfectly accommodating the narrower 964/993 engines.

Product Overview:
Crafted from top-quality aircraft aluminum, our Porsche 964/993 to GT3 Billet Intake Runners offer optimal performance. 
Available in head diameters of 41.5mm, 42.5mm, 44mm or 45.8mm with standard injector sizes. 

Versatile Compatibility and Configurations:
Compatible with standard rails or engineered for use with the IslandWorks/Nuke system, featuring a direct mount fuel regulator. 

Superior Craftsmanship and Finish:
Each runner boasts a natural machined finish and includes a base gasket insulator, ensuring optimal performance.

Important Note:
To ensure effective heat insulation, this product requires a flat cylinder head seal, offering better performance compared to the usual seal type.
Supplied with reinforced high thermal plastic gaskets for thermal insulation

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

96411071101

The product you are viewing cross references to these numbers

Intake manifold stack set. 
Sold as a set of 6
Fits:

Porsche 993 Carrera 2 - 1994 to 1995
Porsche 993 Carrera 4 - 1994 to 1995

PMO Induction have designed an intake manifold “stack” in 356A aluminum, die-cast and machined specifically for your 3.6ltr Porsche 993 from 1994 to 1995.

Replace your cracked, warped or damaged plastic stacks with a permanent solution impervious to engine compartment heat cycles. Solid Works CAD designed and CNC machined for a perfect, long-lasting fit. Anodized black with a machined bore for improved flow characteristics.

• Includes 6 x base gaskets to complete the installation.
• Compatible with forced induction applications and high boost environments.
• PMO Induction logo laser etched into the manifold base (not visible when installed for a clean, period correct look). 
  

Diagram ref no 12 and 13

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99311071250

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