Heat Exchangers

Exhaust racing tube set, without heating function. Ø 41 mm outside inlet tubing.
Replacing heat exchangers

Fits:
Porsche 911 (carb.) Europe 2.0L 10/1964 - 07/1973
Porsche 911 (inj.) Europe 2.0-2.4L 08/1968 - 07/1971
Porsche 911 Europe 2.7L 08/1973 - 07/1975
Porsche 911 Europe 3.0L 08/1977 - 07/1983
Porsche 911 (carb.) USA 2.0-2.4L  08/1965 - 07/1971
Porsche 911 (inj.) USA 2.0-2.4L  08/1968 - 07/1971
Porsche 911 USA Federal 2.7L  08/1974 - 07/1975
Porsche 911 USA Federal 3.0L  08/1977 - 07/1978 

High-performance SSI racing tube set designed to replace the standard heat exchangers on classic Porsche 911 F and G-series models with 2.0L to 3.0L engines.

Developed for performance-focused and motorsport applications, this system removes the conventional heat exchanger assemblies and replaces them with free-flowing exhaust tubes. Eliminating the heater boxes provides a simpler, more direct exhaust path while also removing unnecessary exhaust-system weight for vehicles where cabin heating is not required.

Manufactured from stainless steel, the tubes feature a 41 mm outside diameter at the inlet, making them particularly suited to performance-oriented exhaust configurations where improved gas flow and reduced restriction are priorities.

The SSI racing tube set is ideal for competition cars, lightweight builds, track-day vehicles and modified classic 911s where exhaust performance takes priority over the factory heating system.

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1620101510

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Exhaust racing tube without heating function. Ø 38 mm outside.
Replacing heat exchangers. Painted chrome steel.

Fits:
Porsche 911 T / E / S 2.0-2.4L 1964-73
Porsche 911 / S / CARRERA 2.7L 1974-76

Left or right side
Select below. Price is for each one

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9112209101

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Heat exchanger sets, Stainless Steel.

Improve exhaust gas flow using these "big bore" Bursch heat exchangers.
Made using Ø44 mm outside tubing for a better flow and performance. Increased power output and a quality fit.

Fits:
Porsche 911 (carb.) Europe 2.0ltr 01/63-07/73
Porsche 911 (carb.) USA 2.0ltr -2.4ltr 08/65-07/71
Porsche 911 (inj.) Europe 2.0ltr - 2.4ltr 08/68-07/71
Porsche 911 (inj.) USA 2.0ltr -2.4ltr 08/68-07/71
Porsche 911 Europe 2.7ltr 08/73-07/75
Porsche 911 Europe 3.0ltr 08/77-07/83
Porsche 911 USA Federal 2.7ltr 08/74-07/75
Porsche 911 USA Federal 3.0ltr 08/77-07/78

Price is for a SET OF 2

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1623107312

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Heat control box connecting piece for SSI heat exchangers.

Fits:
Porsche 911 2.7L-3.3 08/1973-07/1986

Diagram ref 20.

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91165911901

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Stainless steel heat exchanger elbow connector.

Fits:
Porsche 911Carrera 3.0 1976-77
Porsche 911 SC 1978-83
Porsche 911 (930) Turbo 3.0L 1975-77
Porsche 911 (930) Turbo 3.3L 1978-89

Diagram ref no 19

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91121113100

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Heat exchanger elbow connector

Fits:
Porsche 911/911S/Carrera 3.0 1975-77
Porsche 911 SC 1978-83
Porsche 911 (930) Turbo 3.0L 1975-77
Porsche 911 (930) Turbo 3.3L 1978-89

Diagram ref no 19

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Heat Exchanger Hexagon Nut – M10
Sold each

Ensure a secure and reliable exhaust installation with this Heat Exchanger Hexagon Nut. Manufactured to original equipment specifications, this high-quality replacement hexagon nut is used to securely fasten the heat exchanger to the engine's exhaust studs, ensuring a tight, leak-free connection.

Fits:

• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 924 2.0L 1976-79
• Porsche 914 (1970-1976)

Diagram ref no 7

Heat exchanger mounting hardware is continually exposed to extreme exhaust temperatures, moisture, road salt and vibration. Over time, the original nuts can corrode, seize or lose their clamping force, making removal difficult and increasing the risk of exhaust leaks. Replacing worn or damaged hardware whenever the exhaust system is removed is considered best practice for both servicing and restoration work.

Manufactured from durable, corrosion-resistant materials, this OE Match hexagon nut provides dependable clamping force and long service life, making it ideal for routine maintenance, exhaust repairs and concours restorations.

What Does the Heat Exchanger Hexagon Nut Do?

The hexagon nut secures the heat exchanger to the cylinder head via the exhaust studs.

Its primary functions include:

• Securing the heat exchanger firmly in position.
• Maintaining correct gasket compression.
• Preventing exhaust gas leaks.
• Resisting loosening caused by vibration and heat cycling.
• Supporting proper exhaust alignment.
• Helping maintain engine performance and efficiency.

Correctly tightened exhaust hardware is essential for a safe and reliable exhaust system.

Why Should the Heat Exchanger Nut Be Replaced?

Exhaust mounting hardware operates under extremely demanding conditions.

Common reasons for replacement include:

• Corrosion caused by moisture and road salt.
• Heat cycling leading to material fatigue.
• Seized or rounded nuts during removal.
• Damaged threads.
• Reduced clamping force.
• Exhaust system restoration.
• Heat exchanger replacement.

Replacing the hardware during exhaust work helps avoid future maintenance issues and ensures a secure installation.

Symptoms of Worn or Damaged Exhaust Hardware

Typical signs include:

• Rusted or heavily corroded nuts.
• Seized fixings.
• Exhaust leaks.
• Loose heat exchanger.
• Rattling exhaust components.
• Broken or damaged fasteners.
• Difficulty removing existing hardware.

Renewing the mounting hardware helps restore the integrity of the complete exhaust system.

When Should the Heat Exchanger Hexagon Nut Be Replaced?

Replacement is recommended whenever:

• Heat exchangers are removed.
• Exhaust gaskets are replaced.
• Exhaust manifold repairs are carried out.
• Engine rebuilds are performed.
• Restoring a classic Porsche.
• Existing nuts show signs of corrosion or damage.

Installing new hardware during reassembly helps ensure reliable sealing and long-term durability.

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99908400202

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Hexagon headed heat exchanger bolt to muffler.

Fits:
Porsche 911 1969 - 1977
Porsche 914-6 1970 - 1976
Porsche 924 1976 - 1979

Diagram ref no 6

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Hexagon headed heat exchanger bolt to muffler.

Fits:
Porsche 911 1969 - 1977
Porsche 914-6 1970 - 1976
Porsche 924 1976 - 1979

Diagram ref no 6

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90007514803

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Heat exchanger mounting kit.

Fits:
Porsche 911 1974-84

*If using with 1985 onwards 3.2L you may need 6x 93011119112 42mm bore Manifold gaskets

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PCG91121100

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Mounting Kit For Exhaust.

The Porsche Exhaust Mounting Kit – OE Match (Part Number: PCG91121100/1) is a replacement fitting and fastening kit designed to securely install and support the exhaust heat exchangers on selected classic Porsche 911 models.

Fits:

• Porsche 911 2.7L / 3.0L / *3.2L 08/73-07/85

*If used with 1984 onwards 3.2L you may need 6x 93011119112/1 42mm bore Manifold gaskets 

Designed as an alternative to the original Porsche exhaust mounting kit, this OE Match replacement provides the necessary mounting hardware for correctly securing compatible exhaust components, helping maintain a stable installation and reliable sealing at the exhaust connections.

The exhaust mounting system operates in an extremely demanding environment, exposed to high temperatures, constant engine vibration, moisture and road contamination. Over time, original mounting bolts, nuts, studs and other fastening components can become corroded, weakened, seized or damaged during exhaust removal.

Replacing worn or deteriorated exhaust mounting hardware helps maintain secure exhaust connections, minimise unwanted vibration and reduce the likelihood of exhaust gas leaks.

Ideal for exhaust system repairs, heat exchanger replacement, engine maintenance and classic Porsche restoration projects, this OE Match mounting kit offers a practical and cost-effective alternative to Genuine Porsche-branded mounting hardware.

What This Product Does:
The exhaust mounting kit provides the fastening components required to securely attach compatible exhaust heat exchangers and associated exhaust components to the engine.

Correctly installed exhaust mounting hardware maintains the clamping force required for secure connections and effective sealing between the exhaust components and the cylinder heads.

Its main functions include:

• Securing exhaust components: Provides the mounting hardware needed to correctly fasten heat exchangers and associated exhaust fittings.
• Maintaining exhaust joint sealing: Helps apply consistent clamping pressure to the exhaust gaskets, reducing the risk of exhaust gas leakage.
• Supporting exhaust system stability: Keeps exhaust components correctly positioned during engine operation.
• Reducing vibration and rattling: Helps prevent unwanted movement caused by loose or deteriorated fasteners.
• Withstanding high operating temperatures: Provides mounting hardware suitable for the demanding thermal conditions surrounding the exhaust system.
• Supporting reliable exhaust performance: Maintains secure exhaust connections for effective exhaust gas flow.
• Facilitating exhaust repairs: Provides replacement fastening components during heat exchanger installation, exhaust maintenance or engine restoration.

Symptoms Of Wear Or Failure:
Exhaust mounting hardware is continually subjected to extreme temperatures, repeated heating and cooling cycles, engine vibration and exposure to moisture. These conditions can cause corrosion, metal fatigue, loosening or seizure over time.

Common signs of worn or damaged exhaust mounting components include:

• Corroded or rusted fasteners: Exhaust mounting nuts, bolts and studs may become heavily corroded, reducing their strength and making removal difficult.
• Loose exhaust components: Deteriorated or incorrectly tightened hardware may allow movement around the heat exchanger or exhaust connections.
• Exhaust gas leaks: Damaged or loose fasteners can reduce gasket clamping pressure, allowing exhaust gases to escape from the joints.
• Increased exhaust noise: Leaking exhaust connections may produce ticking, blowing or hissing sounds, particularly during acceleration or when the engine is cold.
• Rattling or vibration: Loose mounting components may allow the exhaust system to vibrate excessively, producing unwanted metallic noises.
• Broken or missing mounting hardware: Heat exposure, corrosion or mechanical stress may cause mounting studs or bolts to fracture.
• Exhaust fumes or unusual odours: Leaking exhaust joints may allow exhaust gases to escape into the surrounding engine area.
• Difficulty removing exhaust components: Severely corroded or seized mounting hardware may complicate routine servicing and heat exchanger replacement.

Why Replacement Matters:
Replacing deteriorated exhaust mounting hardware is important for maintaining the structural integrity, sealing performance and long-term reliability of the Porsche 911 exhaust system.

Old or corroded mounting components may no longer provide the correct clamping force required to keep exhaust connections secure. This can result in exhaust gas leaks, excessive vibration, rattling and potential damage to surrounding components.

Severely corroded hardware may also break during removal, making future exhaust repairs more difficult and time-consuming.

Installing a replacement OE Match Exhaust Mounting Kit helps to:

• Restore secure exhaust installation: Ensure compatible heat exchangers and exhaust components are correctly fastened.
• Help prevent exhaust leaks: Maintain appropriate gasket clamping pressure for reliable sealing.
• Reduce unwanted vibration: Minimise rattling and movement caused by loose or weakened mounting hardware.
• Improve exhaust system reliability: Replace aged, corroded or damaged fasteners before they cause further problems.
• Support safe vehicle operation: Help reduce the risk of exhaust gases escaping through poorly secured connections.
• Simplify exhaust maintenance: Provide replacement mounting hardware when removing and refitting heat exchangers.
• Protect surrounding components: Reduce the risk of excessive movement or stress on adjacent exhaust components.
• Support classic Porsche restoration: Restore the intended exhaust mounting arrangement during engine rebuilding or vehicle refurbishment.
• Offer a cost-effective repair: Provide an OE Match alternative to the Genuine Porsche mounting kit.

Replacing exhaust mounting hardware during heat exchanger replacement or major exhaust servicing is recommended, particularly when existing fasteners show signs of corrosion, damage or deterioration.

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Heat exchanger set, stainless steel, Ø41 mm outer tubes, left and right.

Fits:
Porsche 911 3.2L 08/1983 - 08/1989


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1623107210

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Heat exchanger set, stainless steel, Ø41 mm outer tubes, left / right.

Are you backdating a 3.2 Carrera or 3.2ltr engine?
Use these SSi heat exchangers to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, one out" system seen on the early, pre impact bumper cars.
Made using Ø41 mm outside tubing for a better flow and performance these AISI 321/EN4531 titanium stabilized stainless steel heat exchangers offer long life, increased power output and a quality fit.

IMPORTANT: Major modification needed on engine tin ware when installing on 3.2ltr engines.

Price is for a SET OF 2

Fits:
Porsche 911 (Conversion) 3.2ltr 08/1983 - 07/1989

Core Length: 470 mm
Core Width: 760 mm
Core Depth: 380 mm
Outer diameter: 41 mm

LONG LIFE

Made using AISI 321/EN4531 titanium stabilized stainless steel  the expected life in the severest road conditions (salt) is 20-30 years.

HIGHER POWER OUTPUT
Output is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.

CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the by products of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.

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1623106810

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Heat exchanger set, stainless steel, Ø41 mm outer tubes, left / right.

Are you carrying out an engine swap to fit a 964 / 993 3.6ltr to an early 911?
Use these SSi heat exchangers to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, one out" system seen on the early, pre impact bumper cars.
Made using Ø41 mm outside tubing for a better flow and performance these AISI 321/EN4531 titanium stabilized stainless steel heat exchangers offer long life, increased power output and a quality fit.

IMPORTANT: Major modification needed on engine tin ware when installing on 3,6ltr engines.

Price is for a SET OF 2

Fits:
Porsche 911 (Conversion) 3.6ltr 01/1963 - 07/1989

Core Length: 470 mm
Core Width: 750 mm
Core Depth: 370 mm
Outer diameter: 41 mm

LONG LIFE

Made using AISI 321/EN4531 titanium stabilized stainless steel  the expected life in the severest road conditions (salt) is 20-30 years.

HIGHER POWER OUTPUT
Output is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.

CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the byproducts of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.

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1623107110

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Heat exchanger sets, Stainless Steel.

Improve exhaust gas flow using these "big bore" SSi heat exchangers.
Made using Ø41 mm outside tubing for a better flow and performance these AISI 321/EN4531 titanium stabilized stainless steel heat exchangers offer long life, increased power output and a quality fit.

Fits:
Porsche 911 (carb.) Europe 2.0ltr 01/63-07/73
Porsche 911 (carb.) USA 2.0ltr -2.4ltr 08/65-07/71
Porsche 911 (inj.) Europe 2.0ltr - 2.4ltr 08/68-07/71
Porsche 911 (inj.) USA 2.0ltr -2.4ltr 08/68-07/71
Porsche 911 Europe 2.7ltr 08/73-07/75
Porsche 911 Europe 3.0ltr 08/77-07/83
Porsche 911 USA Federal 2.7ltr 08/74-07/75
Porsche 911 USA Federal 3.0ltr 08/77-07/78

Price is for a SET OF 2

LONG LIFE
Made using AISI 321/EN4531 titanium stabilized stainless steel  the expected life in the severest road conditions (salt) is 20-30 years.

HIGHER POWER OUTPUT
Output is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.

CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the byproducts of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.

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Heat Exchanger Sets USA 1980-83 911 3.0ltr Porsche 911 K-Jet Engine Thick Flanges
Price is for a SET OF 2

Fits: USA MODELS
PORSCHE 911 07/77 - 06/80 3.0L Petrol 180bhp 930.03, 930.13
PORSCHE 911 09/79 - 06/80 3.0L Petrol 188bhp 930.09, 930.19
PORSCHE 911 08/80 - 07/83 3.0L Petrol 204bhp 930.10
PORSCHE 911 03/74 - 10/83 3.0L Petrol 209bhp From 1979/08, To 1983/07

LONG LIFE
Made using AISI 321/EN4531 titanium stabilized stainless steel  the expected life in the severest road conditions (salt) is 20-30 years.

HIGHER POWER OUTPUT
Output is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.

CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the byproducts of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.

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