Exhaust Fitting Kits

Mounting Kit for one Heat Exchanger 
2 required per car

Restore the integrity of your Porsche Turbo exhaust system with this OE Match Heat Exchanger Mounting Kit, designed specifically for selected Porsche 911 Turbo models. Manufactured to original equipment specifications, this complete fitting kit provides the essential hardware required to securely mount the heat exchangers, ensuring correct alignment, reliable sealing and long-term durability under the extreme operating temperatures produced by the turbocharged flat-six engine.

Fits:

• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

Kit included:
1x Large gasket for mounting heat exchanger to intermediate tube
3x Gasket for heat exchanger to cylinder head. 3 pcs. required for each heat exchanger
3x Bolt, M8x1.25x40mm
3x Nut M8x1.25, for mounting heat exchanger to cylinder head
3x Lock nut, M8x1.25
3x Nut, M8x1.25

Whether you're replacing worn heat exchangers, installing a new exhaust system or carrying out a full restoration, using new mounting hardware helps guarantee a secure installation while protecting valuable exhaust components from vibration and premature wear.

What Does the Heat Exchanger Mounting Kit Do?

The heat exchanger mounting kit secures the heat exchangers firmly to the engine and exhaust system while allowing for normal thermal expansion during operation.

Its primary functions include:

• Securing the heat exchangers to the engine.
• Maintaining correct exhaust system alignment.
• Supporting efficient cabin heating performance.
• Reducing vibration and unwanted movement.
• Helping maintain an effective exhaust gas seal.
• Preventing unnecessary stress on exhaust studs and flanges.

Correct mounting hardware is essential for the safe and reliable operation of both the exhaust and heating systems on the Porsche 911 Turbo.

Why Do Heat Exchanger Mounting Kits Fail?

Turbocharged engines generate significantly higher exhaust temperatures than naturally aspirated models, placing additional stress on mounting hardware. Common causes of failure include:

• Corrosion caused by moisture and road salt.
• Extreme heat cycles weakening fasteners.
• Seized or damaged nuts and bolts.
• Exhaust vibration causing fatigue over time.
• Damaged fixings during exhaust removal.
• Age-related deterioration after decades of service.

As the hardware deteriorates, heat exchangers can become loose, resulting in exhaust leaks, rattles, vibration and increased stress on surrounding exhaust components.

When Should the Heat Exchanger Mounting Kit Be Replaced?

The mounting kit should always be inspected whenever the heat exchangers or exhaust system are removed. Replacement is recommended if you notice:

• Rusted or seized fasteners.
• Broken or stretched hardware.
• Loose heat exchangers.
• Exhaust leaks around the mounting flanges.
• Excessive vibration or rattling.
• Damaged washers, locking plates or mounting hardware.

Many Porsche specialists recommend fitting a new mounting kit whenever replacing heat exchangers or carrying out major exhaust work to ensure reliable installation and avoid reusing weakened or corroded hardware.

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

91103KIT

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Mounting Kit for one Heat Exchanger 
2 required per car

Restore the security and reliability of your Porsche exhaust system with this OE Match Heat Exchanger Mounting Kit, designed specifically for the Porsche 911 3.2 Carrera (1984–1989) and the 930 turbo (1984-1989). Manufactured to original equipment specifications, this comprehensive fitting kit contains the essential hardware required to securely install the heat exchangers, ensuring correct alignment, reliable sealing and long-lasting durability.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

Kit included:
1x Large gasket for mounting heat exchanger to intermediate tube
3x Gasket for heat exchanger to cylinder head. 3 pcs. required for each heat exchanger
3x Bolt, M8x1.25x40mm
3x Nut M8x1.25, for mounting heat exchanger to cylinder head
3x Lock nut, M8x1.25, cu. Plated
3x Nut, M8x1.25

 Whether you're replacing tired heat exchangers, installing a new exhaust system or carrying out a concours-quality restoration, fitting new mounting hardware ensures every component is correctly secured while reducing the risk of vibration, exhaust leaks and premature hardware failure.

What Does the Heat Exchanger Mounting Kit Do?

The heat exchanger mounting kit provides the fixings needed to attach the heat exchangers securely to the engine and exhaust system. It plays an important role by:

• Securing the heat exchangers to the engine.
• Maintaining correct exhaust alignment.
• Supporting efficient cabin heating performance.
• Reducing vibration and unwanted movement.
• Helping maintain leak-free exhaust joints.
• Allowing for normal expansion and contraction as exhaust temperatures change.

Correct mounting hardware is essential for maintaining both exhaust efficiency and the performance of the Porsche heating system.

Why Do Heat Exchanger Mounting Kits Fail?

The mounting hardware operates in an extremely demanding environment, exposed to continuous heat, moisture and vibration. Over time, components can fail due to:

• Corrosion caused by road salt and moisture.
• Heat cycles weakening fasteners.
• Rusted or seized nuts and bolts.
• Fatigue caused by engine vibration.
• Damage during previous exhaust repairs.
• Age-related deterioration after decades of service.

As the hardware deteriorates, the heat exchangers can loosen, resulting in exhaust leaks, rattles, poor alignment and additional stress on surrounding components.

When Should the Heat Exchanger Mounting Kit Be Replaced?

The mounting hardware should be inspected whenever the exhaust or heat exchangers are removed. Replacement is recommended if you notice:
Rusted or seized fasteners.

• Broken or stretched hardware.
• Loose heat exchangers.
• Exhaust leaks around mounting flanges.
• Excessive vibration or rattling.
• Damaged washers, locking plates or mounting brackets.

Most Porsche specialists recommend fitting a new mounting kit whenever new heat exchangers are installed, ensuring reliable installation and avoiding the reuse of weakened or corroded fixings.