Exhaust Nuts / Bolts / Studs

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
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90037810501

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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

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Exhaust hexagon nut.
Sold EACH

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 GT3 2000-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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90038000501

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Exhaust hexagon nut. M8 zinc plated. Self locking.
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
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90038000501

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Titanium exhaust manifold bolts M8x27. Torx head.
Pack of 18 pcs.

Fits:
Porsche 996 Turbo / GT2 / GT3 1999-2005
Porsche 997.1 Turbo / GT2 / GT3 2007-2009
Porsche 997.2 Turbo / GT2 RS / GT3 2010-2013

Porsche 991 Turbo / Turbo S / GT2RS  2014-2020

Titanium is a highly corrosion-resistant material, which is particularly important in exhaust systems due to the exposure to extreme heat and moisture. The corrosion resistance of titanium bolts ensures longevity and reduces the risk of premature failure, ultimately saving the owner from costly repairs.

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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TITANTORXLONG18

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Titanium exhaust manifold bolt M8x27. 
Set of 12  (OE Ref: 99907358901) 

Titanium is a highly corrosion-resistant material, which is particularly important in exhaust systems due to the exposure to extreme heat and moisture. The corrosion resistance of titanium bolts ensures longevity and reduces the risk of premature failure, ultimately saving the owner from costly repairs.

Fits:
Porsche 986 Boxster 1997-2004
Porsche 987 Boxster 2005-2008
Porsche 987C Cayman 2006-2008
Porsche 996 Carrera 1998-2004
Porsche 997.1 Carrera 2005-2008
Porsche 718 (982) Boxster 2017-2021
Porsche 718 (982C) Cayman 2017-2021

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

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TITANTORXLONG12

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Exhaust manifold bolt. M8 x 28.
EACH

Fits:
Porsche 986 Boxster 1997-04
Porsche 996 C2 / C4 3.4L >>2001
M96.01, M96.02, M96.03,
Porsche 996 GT3 / GT3 RS 2000-05
Porsche 997 GT3 2007-10

Click 'Zoom in' for large parts diagram.
Diagram ref no 4.

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90037813100

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Exhaust manifold bolt. M8 x 28.
EACH

Fits:
Porsche 986 Boxster 1997-04
Porsche 996 C2 / C4 3.4L >>2001
M96.01, M96.02, M96.03,
Porsche 996 GT3 / GT3 RS 2000-05
Porsche 997 GT3 2007-10

Click 'Zoom in' for large parts diagram.
Diagram ref no 4.

Related reference numbers
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90037813100

The product you are viewing cross references to these numbers

Exhaust manifold bolt. M8 x 28.
12 Per car. Sold each

Fits:
Porsche 996 C2 / C4 / C4S
M96.03, 3.6L

Click 'Zoom in' for large parts diagram.
Diagram ref no 4.

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9990750710A

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Exhaust Manifold Bolt. M 8 x 28.

EACH

Fits:
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 4.

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90037822701

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Exhaust manifold to catalytic converter bolt
M8 x 35. EACH

Fits:
Porsche 986 Boxster 1997-05
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05

Exhaust Manifold to Catalytic Converter Nut.
M8. EACH

Fits:
Porsche 986 Boxster 1997-05
Porsche 987C Cayman 2005-08
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05

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99908405202

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Exhaust Manifold to Catalytic Converter M8 Nut. Made out of Titanium.

Fits:
Porsche 986 Boxster 1997-05
Porsche 987C Cayman 2005-08
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05

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99908405202T

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OE Match stainless steel bolt for the exhaust manifold-to-catalytic-converter connection, supplied individually; check the dimensional note below before selecting replacement hardware.

Fits

Porsche 986 Boxster 1997-05
Porsche 996 C2 / C4 / C4S 1997-05
Porsche 996 GT3 1999-05

Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

This fastener joins the relevant exhaust flange components. Working with the specified mating hardware and seal, it provides the clamping needed to hold the connection together.

Functions

• Fastens the manifold-to-catalyst joint.
• Helps retain flange alignment during assembly.
• Replaces damaged or missing exhaust-joint hardware.
  
  

Technical Details

• Reference: 90007428702; brand: OE Match; material: stainless steel.
• Product specification: M8 x 40. EACH
  
  

Symptoms of Fault

Broken fixings, damaged threads, recurrent loosening or flanges that do not close evenly warrant inspection. Ticking, rattling or soot around the connection may indicate leakage, although the gasket and flange surfaces also need checking.

Why Replacement Matters

Seized or damaged hardware can complicate dismantling and prevent correct reassembly. Renewing unsuitable fixings supports even joint clamping; inspect adjoining nuts, seals and mounting components rather than assuming the bolt alone will resolve a leak.

FAQs

Should other hardware be checked?
Inspect the mating nuts, gasket, flange faces and nearby supports during the repair.

Should anti-seize be applied?
Follow the applicable fitting procedure and torque specification; do not assume lubricated and dry tightening requirements are interchangeable.

Which length should I select?
The product specification and diagram reference differ. Confirm the fixing position and required dimensions before fitting.

Related reference numbers
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90007428702

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High performance stud + nut kits for the exhaust manifold to cylinder head for Porsche. Using titanium and Inconel alloy studs, aerospace lock nuts, and a well-thought and balanced combination of metals and plating/coatings, our fasteners will perform better than the traditional fastener. They will never oxidize, and hence will unscrew easily when required.

Novel ultra-high-performance product
• Use of Inconel 718 and aerospace technology
• Extreme perceived quality

Contains 12 x Studs, Nuts & Washers

Fits:
Porsche 911 1965-77
Porsche 964 (non Turbo)
Porsche 993 All
Porsche 996 (non Turbo)
Porsche 997 (non Turbo)
Porsche 986 All
Porsche 987 All
Porsche 718 4 Cyl Turbo

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SL-In-12

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Metal Polish for Exhaust & Tail pipes
100ml

After years of being asked to come up with a solution from our dealers, race-teams and end-users, we have now solved a perennial problem for many conscientious owners; namely, how to refresh their stainless exhaust system to an 'as-new' condition when detailing the car. After several months of testing in all markets and weather conditions, we will soon be releasing a tailored metal polish that will render any stainless steel exhaust system or metal component ready for concours or show duty, with the minimum of effort. Perfect not only for keeping your Milltek system in tip-top condition, but also any other polished or chromed parts on your car (or bike!) too.

The polish has been developed by our R&D engineers in association with leading car care experts, Dodo Juice. The result is a high shine, mild-abrasive polish that can be used on all types of metal, including chrome. Sophisticated diminishing abrasives remove contaminants initially, then refine for a mirror finish while the chemical cleaning action helps dissolve fuel, oil and soot deposits. The final finishing touch is down to the use of an active sealing ingredient helps metal resist future tarnishing. The polish has been formulated to work well with any medium resistance, short-pile cloth and is an absolute doddle to apply or remove, making the art of restoring any metal surface the work of mere minutes.

100ml bottle with a FREE microfibre cloth, which should be more than enough for 20 intensive back boxes and tail trim cleans.