This part number supersedes to 90007423302 Genuine Porsche part 90007426702

Exhaust Bolt M8x40
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Ensure secure and reliable exhaust system installation with this M8x40 Exhaust Bolt, suitable for a wide variety of Porsche exhaust applications. Used throughout numerous exhaust assemblies including heat exchangers, manifolds, cross pipes, silencers, mounting brackets and associated exhaust components, this fastener plays a critical role in maintaining the integrity and alignment of the exhaust system.

Fits:

• 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

Exhaust bolts are subjected to extreme operating conditions including heat, vibration, moisture and road contamination. Over time, original fasteners can corrode, weaken, seize or become damaged during maintenance and removal. Replacing worn hardware helps ensure proper clamping force, leak-free operation and long-term exhaust system reliability.

Whether carrying out routine maintenance, replacing exhaust components or undertaking a full restoration project, fitting new exhaust hardware is considered best practice for achieving professional results.

What Does an Exhaust Bolt Do?

An exhaust bolt is designed to securely fasten exhaust components together while maintaining the clamping force required for proper gasket sealing and component alignment.

A correctly installed exhaust bolt helps provide:

• Secure exhaust system assembly
• Proper gasket compression
• Reduced risk of exhaust leaks
• Correct component alignment
• Improved system reliability
• Resistance to vibration-related loosening
• Safe long-term operation

Although small, exhaust fasteners are essential to the overall performance and durability of the exhaust system.

Symptoms of Wear or Failure

Exhaust hardware operates in one of the harshest environments on the vehicle. Continuous heat cycles and exposure to the elements can cause fasteners to deteriorate over time.

Common signs of worn or damaged exhaust bolts include:

• Corrosion or rust build-up
• Seized or stripped threads
• Broken bolts during removal
• Loose exhaust components
• Exhaust leaks around joints
• Excessive exhaust vibration
• Rattling exhaust noises
• Inability to achieve correct torque settings
• Visible deterioration of fastener surfaces

Failing exhaust hardware can compromise the effectiveness of gaskets and lead to premature exhaust system wear.

Why Replacement Matters

Replacing ageing exhaust bolts helps ensure reliable fastening and proper exhaust system sealing.

Benefits include:

• Improved exhaust system security
• Reduced risk of exhaust leaks
• Better gasket performance
• Easier future maintenance
• Improved component alignment
• Enhanced reliability
• Professional-quality repairs
• Protection of exhaust system components

Whenever exhaust components are removed, replacing worn fasteners helps prevent future issues and ensures long-term durability.

Features & Benefits

• M8 x 40mm exhaust bolt
• Suitable for various Porsche exhaust applications
• High-strength exhaust system fastener
• Helps maintain proper exhaust sealing
• Supports secure component installation
• Resistant to exhaust system vibration
• Ideal for repairs, maintenance and restoration projects
• Direct replacement for worn or corroded hardware

Complete your Porsche exhaust repair correctly with quality M8x40 Exhaust Fasteners from Design911

Fits:
Porsche 993 1994-98
Porsche 993 Turbo

Diagram Ref no 9.

*If using with 1985 onwards 3.2L you may need 6x 93011119112 42mm bore Manifold gaskets