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- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
Sold individually. 18 required per car.
Fits:
Porsche 987.2 Boxster 2009-2012
Porsche 987C.2 Cayman 2009-2012
Porsche 997.2 Carrera 2009-2012
Porsche 981 Boxster 2012-2016
Porsche 981C Cayman 2014-2016
Porsche 991 MKI 2012-2016
Porsche Cayman GT4 2016
Click 'Zoom in' for large parts diagram.
Diagram ref no 34
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99907353502
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 911 1978-1983 3.0L / SC
- 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 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
3 per heat exchanger.
Fits:
Porsche 911 1965-89 (6 for both heat exchangers)
Porsche 964 Carrera 1989-94 (4 for both heat exchangers)
Porsche 993 Carrera 1994-98 (5 for both heat exchangers)
Porsche 993 Turbo 1994-98 (4 for both heat exchangers)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99908500103
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Fits:
Porsche 911 1965-89
Porsche 911 (930) Turbo 1975-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90006716102
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Heat
Exchanger Mounting Kit
Ensure a secure and reliable installation of
your air-cooled Porsche exhaust system with this OE Match Heat Exchanger
Mounting Kit. This complete hardware kit contains
the essential mounting components required when installing or replacing heat
exchangers.
Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1976 2.7L / 1976 3.0 Carrera
Heat exchangers are exposed to constant heat cycles, moisture, road salt and vibration, making the original mounting hardware highly susceptible to corrosion, seized fasteners and fatigue. Reusing old hardware can make installation difficult and may compromise the security and alignment of the exhaust system.
This OE Match mounting kit provides the correct replacement hardware to ensure your heat exchangers are securely fitted, helping maintain proper exhaust sealing, reduce unwanted movement and support long-term reliability. Whether you're replacing heat exchangers, rebuilding an engine or carrying out a full restoration, installing new mounting hardware is always recommended.
Manufactured to OE Match standards, every component is designed for precise fitment and dependable performance.
What Does the Heat Exchanger Mounting Kit Do?
The mounting kit provides the hardware required to securely fasten the heat exchangers to the engine and exhaust system.
Its primary functions include:
- Securing the heat exchangers in the correct position.
- Maintaining proper exhaust alignment.
- Supporting effective exhaust sealing.
- Preventing movement caused by vibration.
- Providing reliable long-term fastening.
- Simplifying heat exchanger installation.
Using new mounting hardware helps ensure the exhaust system performs correctly while reducing the likelihood of future maintenance issues.
Why Replace Heat Exchanger Mounting Hardware?
Original exhaust hardware is subjected to extreme operating conditions and often deteriorates over time.
Common reasons for replacement include:
- Corroded nuts and fasteners.
- Seized or damaged hardware.
- Fatigued mounting components.
- Broken or rounded fasteners during removal.
- Exhaust restoration projects.
- Engine rebuilds.
- Heat exchanger replacement.
- Preventative maintenance.
Replacing the complete mounting hardware during installation helps ensure a secure fit and reduces the risk of future exhaust problems.
Features
- Designed for Porsche 911 (1963-1976).
- Complete installation hardware set.
- Precision manufactured for accurate fitment.
- High-quality, durable components.
- Helps ensure secure heat exchanger installation.
- Restores factory-style mounting.
- Ideal for restoration, repair and engine rebuilds.
- Suitable for replacing worn or corroded original hardware.
Why Choose OE Match Exhaust Components?
OE Match exhaust components and installation hardware are manufactured to deliver factory-quality fitment, durability and long service life. Designed specifically for classic Porsche applications, these components help ensure reliable installation while preserving the originality and performance of your vehicle. Whether you're carrying out a complete restoration or routine maintenance, OE Match products provide the quality expected by Porsche enthusiasts and professional workshops.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91011KIT
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 911 1978-1983 3.0L / SC
- 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 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
OE Match exhaust hex nut designed as a direct-fit replacement fastener for the exhaust heat exchanger studs on classic Porsche 911 (1965–1998) engines. This hex nut secures the heat exchanger to the cylinder heads and exhaust studs, ensuring reliable fastening in the high-heat exhaust system environment.
Sold individually. 4, 5, or 6 required, depending on car model.
Fits:
Porsche 911 1965-89 (6 for both heat exchangers)
Porsche 964 Carrera 1989-94 (4 for both heat exchangers)
Porsche 993 Carrera 1994-98 (5 for both heat exchangers)
Porsche 993 Turbo 1994-98 (4 for both heat exchangers)
Diagram ref no 5
The hex nut is used in conjunction with the heat exchanger studs and exhaust system components to clamp the exhaust heat exchanger securely in place and maintain a sealed joint between mating parts.
The exhaust hex nut’s role may seem simple, but it’s critical to the integrity of the heat exchanger and exhaust assembly:
• Secures the heat exchanger studs to the engine block/exhaust flange
• Maintains clamp force under thermal cycling and vibration
• Helps prevent exhaust leaks at the heat exchanger interface
• Resists corrosion and heat exposure typical of exhaust temperatures.
Proper fastening ensures that the heat exchanger - which routes exhaust gasses away from the cylinders and towards the muffler system - remains sealed and aligned throughout engine operation.
Function
• Fastening: Threads onto the exhaust/heat exchanger stud to clamp components
• Retention: Holds joint integrity under vibration and thermal expansion
• Seal support: Helps maintain exhaust system seal and prevents leaks
• Heat resilience: Engineered from heat-resistant material for exhaust applications.
Worn, rusted, or missing hex nuts can lead to loose exhaust joints, exhaust leaks, poor performance, and increased noise.
Although small, exhaust hex nuts play a critical role in maintaining proper heat exchanger sealing and long-term exhaust durability. Over time, exposure to extreme heat and exhaust gases can cause nuts to corrode, seize, lose clamping force, or break during removal, leading to exhaust leaks and compromised sealing at the cylinder head. Replacing them with OE Match hex nuts restores secure fastening, helps prevent leaks, protects surrounding engine components from excess heat, and preserves overall exhaust performance.
Exhaust hex nuts should be replaced whenever the heat exchanger or exhaust system is removed, if the existing nuts are corroded, seized, rounded, or damaged, or when exhaust leaks are detected at the heat exchanger interface.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99908500103
The product you are viewing cross references to these numbers