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Exhaust Nuts / Bolts / Studs
By OE Match
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Fits:
Porsche 997.1 Carrera 2 / Carrera 4 3.6ltr - 2005 to 2008
Porsche 997.1 Carrera 2S / Carrera 4S 3.8ltr - 2005 to 2008
Included in kit:
2 x Pipe Connector, 55x58.5x75mm, stainless steel
2 x Bolt, M8x1.25x140mm
2 x Bolt, M8x1.25x70mm
4 x Lock nut, M8x1.25
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHFITTING.997.1.1
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Exhaust Hexagon Head Bolt (Short)
Sold each
Ensure a secure and reliable exhaust installation with this
OE Match Short Exhaust Hexagon Head Bolt.
Manufactured to the original factory specification, this provides the correct strength, thread specification and fit required for
securing exhaust components.
Fits:
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Diagram ref no 25
Exhaust hardware operates in one of the harshest environments on any vehicle, being subjected to extreme temperatures, vibration, corrosion and repeated heating and cooling cycles. This OE Match bolt is manufactured from high-quality materials to deliver dependable clamping force and long service life, making it ideal for routine repairs, exhaust upgrades or complete engine rebuilds.
What Does the Exhaust Hexagon Head Bolt Do?
The exhaust bolt is a critical fastening component within the exhaust system.
Its primary functions include:
- Securing exhaust components together.
- Maintaining correct clamping force between mating surfaces.
- Preventing exhaust leaks.
- Resisting loosening caused by vibration and thermal expansion.
- Helping maintain proper alignment of exhaust components.
- Supporting reliable long-term exhaust system performance.
Using the correct OE-specification fasteners helps ensure safe and leak-free exhaust operation.
Why Do Exhaust Bolts Need Replacing?
Exhaust bolts are continually exposed to harsh operating conditions.
Common causes of deterioration include:
- Corrosion caused by moisture and road salt.
- Extreme exhaust temperatures.
- Repeated heat cycles causing fatigue.
- Thread damage during removal.
- Seizure due to oxidation.
- Rounded or damaged bolt heads during servicing.
Once removed, older exhaust hardware is often unsuitable for reuse due to corrosion or loss of clamping performance.
When Should They Be Replaced?
Replacement is recommended when:
- Removing or replacing exhaust components.
- Installing new silencers, catalytic converters or manifolds.
- Repairing exhaust leaks.
- The original bolt is corroded or seized.
- Threads are damaged or worn.
- Carrying out engine or exhaust system restoration.
- Performing preventative maintenance during exhaust servicing.
Replacing exhaust hardware whenever the system is dismantled helps ensure reliable sealing and simplifies future maintenance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90037810501
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
This long exhaust hexagon head bolt from OE Match has an M8 thread and a length of 140mm.
Fits
- Porsche 996 C2 / C4 / C4S 1998-05
- Porsche 996 GT3 2000-05
- Porsche 997 C2 / C4 / C2S / C4S 2005-08
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no: 24
What This Product Does
This threaded fixing retains components within the exhaust assembly. Selecting the specified bolt length and thread is important when renewing damaged hardware or reassembling the exhaust after repairs.
Functions
- Fastens the relevant exhaust assembly components.
- Provides a hexagonal head for tool engagement.
- Replaces the long fixing at the identified diagram positions.
Technical Details
- Part number: 90037818301; long hexagon-head bolt, M 8 X 140.
- Supply unit: EACH. The supplied diagrams specify two bolts per illustrated assembly; this is not a two-piece pack.
Symptoms of Fault
- Rust, damaged threads or a fractured bolt.
- A fixing that seizes during dismantling.
- Loosening, rattling or movement around the fastening point.
- Difficulty achieving the specified tightening torque.
Why Replacement Matters
Heat cycling and corrosion can leave exhaust hardware difficult to remove or unsuitable for refitting. Renewing damaged fixings supports correct reassembly. Inspect adjoining brackets, nuts and other hardware rather than assuming the bolt alone accounts for a loose or noisy exhaust.
FAQs
- Are two bolts included?
No. Supply is EACH; the diagram quantity describes the assembly requirement. - Can I substitute a shorter bolt?
Use the length specified for the fastening position; this version measures 140mm. - Should anti-seize be applied?
Follow the applicable workshop instructions, including any requirements for thread preparation and tightening torque.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90037818301
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
An OE Match exhaust hexagon nut (M8 size) designed as a self-locking fastener for securing exhaust system components on Porsche 996 and 997 models.
Sold each
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 1905
Porsche 996 GT3 2000 - 2005
Porsche 997 C2 / C4 / C2S / C4S 2005 - 2008
Diagram ref no 16
This hexagon nut secures exhaust system components in place, maintaining tight connections and preventing loosening caused by heat cycles and vibration.
Function
• Secures exhaust components and mounting points
• Provides a self-locking, vibration-resistant fit
• Maintains tight clamping force under heat stress
• Resists corrosion and environmental exposure
• Ensures safe and stable exhaust system assembly
Exhaust fasteners are exposed to extreme heat cycles and corrosion, which can cause nuts to seize, degrade, or lose their locking ability. This can result in exhaust leaks, loose components, or difficulty during removal.
Replacing worn or damaged nuts ensures secure fastening, prevents exhaust system issues, and simplifies future maintenance.
When to replace
• During exhaust repairs or replacement
• Nut is corroded, seized, or rounded
• Loss of locking function or clamping strength
• Evidence of exhaust leaks at joints
• As part of preventative maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90038000501
The product you are viewing cross references to these numbers
-
exhaust system for 997.1 M96.05 3.6L COUPE / CABRIO 2005-08 202-00
-
exhaust system for 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 202-01
-
power steering, power-steering pump and container 997.1 2005-08 403-03
-
pedals 997.1 2005-08 702-00
-
battery, power distributor, starter and generator for 997.1 2005-08 902-05
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
