Exhaust Hexagon Head Bolt (SHORT). Porsche 996 / 997  ❭  90037810501

Exhaust Hexagon Head Bolt (Short) 
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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

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.