Please wait… 
Please wait while we process your order,
do not press the back button… 
Design911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk Facebook Instagram
Porsche specialists based in the UK
Porsche 993 (911) (1994-1998) 993 (911) C4S 1994-97 Exhausts Exhaust Nuts / Bolts / Studs

Exhaust hexagon head bolt, LONG. Porsche 996 / 997 M8 x 140  ›  90037818301

Exhaust hexagon head bolt, LONG. Porsche 996 / 997 M8 x 140 - 90037818301, 00538140
4
Check vehicle fitment
90037818301/1
Product Information
Product Information

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
90037818301
00538140

The product you are viewing cross references to these numbers
Related products
Exhaust hexnut for heat exchanger. Porsche 911 1965-89 - 99908500102, 99908500103, 99908500101 - URO-007389
2
Exhaust hexnut for heat exchanger. Porsche 911 1965-89
Special Order item
99908500103
Product Information
Product Information
Exhaust hexnut for heat exchanger
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
99908500102
99908500103
99908500101

The product you are viewing cross references to these numbers
Exhaust Bolt for Clamp M8 x 65. Porsche 993 - 90007425202 - 90007425202
2
Exhaust Bolt for Clamp M8 x 65. Porsche 993
Special Order item
90007425202
Product Information
Product Information
Exhaust Bolt for Clamp. M8 x 65.
Replacement bolt for clamp



Fits:
Porsche 993 1994-98
Porsche 993 Turbo

Diagram Ref no 9.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90007425202
90007425202

The product you are viewing cross references to these numbers
Exhaust Lock Nut for Bolt. Porsche 993 - 99908405202, 90091000303 - 0369008
4
Exhaust Lock Nut for Bolt. Porsche 993
99908405202/1::1
Product Information
Product Information
Exhaust Lock Nut For Bolt, M8.

The OE MATCH Exhaust Lock Nut for Bolt, M8 is a high-quality replacement fastening nut designed specifically for securing exhaust system components in high-temperature environments. Manufactured to OE specifications, this M8 lock nut features a self-locking design that helps maintain a secure connection despite constant vibration, thermal expansion, and harsh operating conditions.

Fits:

  • Porsche 993 (911) C2 1994-97
  • Porsche 993 (911) C4 1994-97
  • Porsche 993 (911) C2S 1994-97
  • Porsche 993 (911) C4S 1994-97

Used throughout the exhaust system on various Porsche models, this lock nut helps ensure that exhaust flanges, brackets, heat exchangers, silencers, and other exhaust components remain securely fastened. Its heat-resistant construction makes it ideal for long-term durability and reliable exhaust system assembly.

What This Product Does:

  • Secures exhaust system components and mounting hardware
  • Provides a self-locking fastening solution
  • Resists loosening caused by vibration and thermal cycling
  • Maintains secure flange and bracket connections
  • Supports exhaust system stability and alignment
  • Designed for high-temperature exhaust applications

Symptoms Of Wear Or Failure:
  • Loose exhaust components or brackets
  • Exhaust rattles or vibration noises
  • Exhaust leaks at flange connections
  • Corroded, seized, or damaged threads
  • Difficulty maintaining correct fastening torque
  • Missing or broken fastening hardware
  • Exhaust misalignment or movement
  • Increased wear on adjoining exhaust components

Why Replacement Matters:
  • Restores secure fastening of exhaust components
  • Prevents loosening caused by vibration and heat cycles
  • Helps maintain proper exhaust alignment
  • Reduces the risk of exhaust leaks and rattles
  • Protects exhaust flanges, brackets, and mountings from movement-related damage
  • Ensures safe and reliable exhaust system operation
  • Supports long-term durability in harsh exhaust environments
  • Provides OE-quality fit, performance, and reliability



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99908405202
99908405202
90091000303

The product you are viewing cross references to these numbers
Exhaust Washer for Bolt. Porsche 993 - 99902512501, 99902512509
3
Exhaust Washer for Bolt. Porsche 993
Special Order item
99902512501::1
Product Information
Product Information
Exhaust Washer for Bolt.

 

Replacement washer, fits between silencer & tail pipe

Fits:
Porsche 993 1994-98

This product supersedes Porsche's old part numbers:
- 99902512509

Click 'Zoom in' for large parts diagram.
Diagram ref no 10.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99902512501
99902512501
99902512509

The product you are viewing cross references to these numbers