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Exhaust Nuts / Bolts / Studs
By OE Match
- 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
Mounting kit for heat exchanger.

Fits:
Porsche 911 E/S (mech. injection) 2.4ltr / 2.7ltr - 08/1971 to 07/1976
Porsche 911 T (not mech. injection) 2.0ltr / 2.4ltr - 01/1963 to 07/1973
Porsche 911 / 911S / 911 Carrera 2.7ltr - 08/1973 to 07/1975
Kit includes:
3 x heat exchanger gaskets
1 x rear silencer gasket
2 x M10 silencer bolt
2 x M10 silencer nut
3 x M8 heat exchanger nut
3 x M8 beat exchanger barrel nut
1 x M6 nut
1 x M6 washer, nuts & bolts
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHFITTING.911.1
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
- 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

Fits:
Porsche 911 E/S (mech. injection) 2.3L-2.7L 08/1971-07/1976
Porsche 911 T (not mech.injection) 2.0L-2.4L 01/1963-07/1973
Porsche 911/911S/911 Carrera 2.7L 08/1973-07/1975
Kit included:
4 gaskets, nuts & bolts
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91011KIT
The product you are viewing cross references to these numbers
-
Crankcase 911 1965-69 101-05
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crankcase 912 1965-69 101-10
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chain case, camshaft housing 911 1965-69 103-10
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valve control left 911 1965-69 103-15
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valve control right 911 1965-69 103-20
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engine lubrication 911 1965-69 104-00
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engine lubrication 912 1965-69 104-10
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oil supply for converter sportomatic for 911 /L/S/TU UPTO 1968 and 911 T/E 1969 ONWARDS 104-20
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air cooling 911 1965-69 105-00
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air cooling, air duct and engine cover for (S)(D) 912 1965-69 105-10
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air cooling, air duct and engine cover not for (S)(D) 912 1965-69 105-15
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damper filter 2. version - KNECHT - not for (S) + (D) engine number: M 074 2480 >>, for (S) + (D) engine number: M 083 1749 >> and for (F) (I). 912 TARGA UPTO 1968 106-10
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carburettor system with - SOLEX 40 PI-1 - for 911 UPTO 1968 107-06
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carburettor system with SOLEX-40 PII-4 for 912 1965-69 107-10
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injection system throttle body for 911 E/S 1969 ONWARDS 107-25
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vacuum system for clutch release for sportomatic for 911 L/S/TU upto 1968 and 911 T 1969 ONWARDS 107-30
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vacuum system for clutch release injection system for sportomatic for 911 E 1969 ONWARDS 107-35
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fuel pump for 911 upto 1968 201-02
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fuel pump (HARDI) and fuel filter 911 T/E/S 1969 ONWARDS 201-05
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exhaust system 911 1965-69 202-10
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replacement transmission, transmission case, chilled casting 911 1965-69 302-00
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transmission cover, transmission suspension, chilled casting and die casting 911 1965-69 302-05
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converter and converter housing sportomatic 911 1965-69 306-00
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transmission cover, transmission suspension, sportomatic 911 1965-69 307-05
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brake fluid reservoir and brake master cylinder 911 UPTO 1967 604-00
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brake fluid reservoir and brake master cylinder 911 1969 604-10
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transmission control 911 1965-69 701-00
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handbrake, manual throttle, heating, actuator for 911 1968 ONWARDS 701-10
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pedals for Left-Hand Drive cars with manual transmission 911 1965-69 702-00
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pedals for Right-Hand Drive cars with manual transmission 911 1965-69 702-05
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pedals for Right-Hand Drive Cars 911 1969 SPM 702-15
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door lock with installation parts 911 1965-69 804-05
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power windows mechanical (it is necessary to rework) 911 1965-69 804-10
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power windows electric 911 1965-69 804-15
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door glass frame 911 COUPE 1965-69 804-20
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interior equipment doors 911 1969 ONWARDS 807-15
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roof 911 TARGA 1965-69 811-05
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engine electrics 911 1965-69 901-00
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mounting plate 911 1965-69 901-10
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battery 911 upto 1968 902-00
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brake fluid reservoir and brake master cylinder 911 1968 604-05
OEMatch Exhaust Nuts / Bolts / Studs — Flow, Response, Refinement
OEMatch Exhaust Nuts / Bolts / Studs provide robust fasteners for Porsche models to help maintain secure joints and consistent exhaust flow during routine use and higher-load driving. Many owners search for genuine or OEM exhaust nuts, bolts and studs; these are direct-fit alternatives designed to match the original form, fit and function. These fasteners are selected for heat and vibration resistance while keeping routine servicing straightforward.
Available Types
- Hex flange bolts for manifold and flange connections
- Threaded studs with matching nuts for high-temperature joints
- Corrosion-resistant nuts with locking washers and heat-resistant coatings
Understanding OEMatch Exhaust Nuts / Bolts / Studs
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original exhaust nuts, bolts and studs.
OE (Original Equipment) refers to parts matching original specifications for the exhaust nuts, bolts and studs and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM exhaust nuts, bolts and studs engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OEMatch also offers a wide selection of Porsche components, cataloguing over 4,000 individual part numbers and more than 8,700 cross-references while developing additional lines to support maintenance and repair across Porsche generations.
Benefits Include
- Restores and maintains secure exhaust joints to prevent leaks
- Reduces vibration, rattling and movement under thermal cycling
- Improves serviceability with standard thread sizes and corrosion-resistant finishes
Why Exhaust Nuts / Bolts / Studs Wear and Fail
- Corrosion from moisture, road salt and exhaust condensates
- Thermal expansion and contraction leading to loosening or fatigue
- Over-torquing, cross-threading or mechanical damage during servicing
The Importance of Replacing with OEMatch Exhaust Nuts / Bolts / Studs
OEMatch exhaust components are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable. Correct fasteners preserve exhaust sealing, maintain correct alignment of manifolds and pipes, and help protect sensors and downstream emissions equipment. Replacing degraded hardware reduces the risk of leaks, unwanted noise and component damage while supporting reliable performance for Porsche models.
Advantages
- Materials and coatings selected for heat and corrosion resistance
- Thread profiles and lengths aligned to original specifications where applicable
- Standard sizes and finishes to simplify maintenance and reduce the risk of seizing