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Porsche > 964 (911) (1989-1994) > 964 (911) TURBO 3.6L 1991-93 > Exhausts >

Exhaust Nuts / Bolts / Studs

Exhaust Nuts / Bolts / Studs

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DISPLAYING 1 to 10 (of 10 products)
Exhaust Bolt for Exhaust Clamp. Porsche 964 - 90007433902
4
Exhaust Bolt for Exhaust Clamp. Porsche 964
Special Order item
90007433902
Product Information
Product Information
Exhaust Bolt for Exhaust Clamp. M8 x 70.
porsche

Fits:
Porsche 964 C2 / C4 / RS 1990-94
Porsche 964 (965) Turbo 1991-93

Click 'Zoom in' for large parts diagram.
Diagram ref no 8.

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Related, superseded, cross reference or alternative numbers for comparison.

90007433902
90007433902

The product you are viewing cross references to these numbers
Exhaust head stud in Titanium, L 45mm. Porsche 911 / 930 Turbo - 99906223902, 99906223903
3
Exhaust head stud in Titanium, L 45mm. Porsche 911 / 930 Turbo
99906223902T
Product Information
Product Information
Exhaust head stud, L - 45mm. Made out of Titanium (Grade 5 Ti-6Al-4V)
Sold each.

rohler

Fits:
Porsche 911 3.2L 1984-89
Porsche 930 turbo
Porsche 965 turbo

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Related, superseded, cross reference or alternative numbers for comparison.

99906223902T
99906223902
99906223903

The product you are viewing cross references to these numbers
Exhaust Lock Nut for Bolt. Porsche 965 Turbo - 99908405202, 90091000303 - 0369008
4
Exhaust Lock Nut for Bolt. Porsche 965 Turbo
99908405202/1::2
Product Information
Product Information
Exhaust Lock Nut For Bolt.
The OE Match Exhaust Lock Nut for Bolt is a high-quality replacement fastening component designed to securely retain exhaust system bolts in high-temperature operating environments. Manufactured to OE specifications for thread accuracy, strength and heat resistance, this self-locking nut helps maintain secure exhaust connections while resisting loosening caused by heat cycles, vibration and engine movement.  

Fits:
  • Porsche 964 (911) TURBO 3.3L 1991-93
  • Porsche 964 (911) TURBO 3.6L 1991-93

Diagram Ref No 25  

Manufactured from high-strength, corrosion-resistant steel with a durable heat-resistant finish, the lock nut is specifically engineered for use within Porsche exhaust systems. Its self-locking design provides reliable clamping force, helping to maintain leak-free exhaust joints and ensuring long-term reliability of exhaust manifold, catalytic converter, silencer and pipework connections where applicable.  

What This Product Does:
  • Securely fastens exhaust system components together.
  • Maintains consistent clamping force under high temperatures.
  • Resists loosening caused by vibration and thermal expansion.
  • Helps prevent exhaust gas leaks.
  • Supports correct exhaust alignment.
  • Provides reliable fastening for exhaust repairs and installations.
  • Replaces worn, corroded or damaged original lock nuts.
  • Forms an essential part of the exhaust mounting system.

Symptoms Of Wear Or Failure:
  • Loose exhaust components.
  • Exhaust blowing or gas leaks.
  • Rattling or vibrating exhaust system.
  • Corroded or seized fasteners.
  • Damaged or stripped threads.
  • Loss of locking capability.
  • Broken or missing fixing hardware.
  • Difficulty maintaining correct exhaust alignment.
  • Increased exhaust noise.
  • Visible rust or deterioration of the fastening hardware.

Why Replacement Matters:

  • Exhaust fasteners operate in one of the harshest environments on the vehicle, where they are exposed to extreme temperatures, rapid heating and cooling cycles, moisture, road salt and constant vibration. Over time, conventional fasteners can corrode, seize or lose their clamping force, allowing exhaust joints to loosen.
  • A worn or damaged lock nut can result in exhaust leaks, excessive movement and increased stress on surrounding exhaust components. Loose exhaust connections may also generate unwanted noise, reduce exhaust efficiency and accelerate wear of gaskets and mounting hardware.
  • Replacing exhaust lock nuts whenever exhaust components are serviced helps ensure secure, long-lasting connections and reliable sealing. An OE Match replacement provides factory-style fitment, high-strength construction and excellent resistance to heat and corrosion, helping maintain the durability, performance and reliability of your Porsche's exhaust system.



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 strap screw. Porsche 965 Turbo - 90006730900, 1625002900
1
Exhaust strap screw. Porsche 965 Turbo
Special Order item
90006730900::1
Product Information
Product Information
Exhaust strap screw.

porsche

Fits:
Porsche 964 (965) Turbo 1989-94

Click 'Zoom in' for large parts diagram.
Diagram Ref No 37

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

90006730900
90006730900
1625002900

The product you are viewing cross references to these numbers
Exhaust Washer for Bolt. Porsche 965 Turbo - 99902512501, 99902512509
3
Exhaust Washer for Bolt. Porsche 965 Turbo
Special Order item
99902512501::2
Product Information
Product Information
Exhaust Washer for Bolt.

 
porsche

Replacement washer, fits between silencer & tail pipe

Fits:
Porsche 964 (965) Turbo 1991-93

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

Click 'Zoom in' for large parts diagram.
Diagram ref no 20.



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99902512501
99902512501
99902512509

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Lock nut M6. Porsche 964 / 993 - 99908409402, 99908409401
1
Lock nut M6. Porsche 964 / 993
Special Order item
99908409401
Product Information
Product Information
Lock nut M6.
Used for various applications

porsche

Fits:
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1997


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

99908409401
99908409402
99908409401

The product you are viewing cross references to these numbers
Spring washer A10. Porsche 911 / 964 / 993 / 924 / 924S / 944 / 928 - 90002800502, N0122314, PCG012231A - N0122314
2
Spring washer A10. Porsche 911 / 964 / 993 / 924 / 924S / 944 / 928
Special Order item
PCG012231A
Product Information
Product Information
Spring washer A10 - Used in various positions

Fits:
Porsche 911 - 1978 to 1983
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 924 / 924S - 1980 to 1988
Porsche 944 - 1982 to 1991
Porsche 928 - 1978 to 1995



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

PCG012231A
90002800502
N0122314
PCG012231A

The product you are viewing cross references to these numbers
Stud for Exhaust Manifold - M8x30, L: 45mm - for Porsche 911 Carrera 3.2L 1984-1989 & 911 (930) / 964 Turbo 1978-1994 - 99906223902, 99906223903
3
Stud for Exhaust Manifold - M8x30, L: 45mm - for Porsche 911 Carrera 3.2L 1984-1989 & 911 (930) / 964 Turbo 1978-1994
Special Order item
99906223903
Product Information
Product Information
Stud - M8 x 30 / 45mm - which is used to mount the heat exchanger.

Sold individually; x12 required per engine. 

Fits:
Porsche 911 Turbo (930) 1978-89
Porsche 964 Turbo 3.3L 1991-92
Porsche 964 Turbo 3.6L 1993-94

Porsche 911 Carrera 3.2L 1984-89

Diagram ref. 5A.

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

99906223903
99906223902
99906223903

The product you are viewing cross references to these numbers
Stud for Exhaust Manifold - M8x30, L: 45mm - for Porsche 911 Carrera 3.2L 1984-89 & 911 (930) / 964 Turbo 1978-94 - 99906223902, 99906223903 - 99906223902
2
Stud for Exhaust Manifold - M8x30, L: 45mm - for Porsche 911 Carrera 3.2L 1984-89 & 911 (930) / 964 Turbo 1978-94
99906223903/1
Product Information
Product Information
Stud - M8 x 30 / 45mm - which is used to mount the heat exchanger.
This exhaust manifold stud is a high-strength threaded stud used to secure the exhaust manifold (heat exchanger) to the cylinder head on classic air-cooled Porsche 911, Turbo (930), and 964 Turbo models.
Sold individually, 12 required per engine. 

Fits:
Porsche 911 Turbo (930) 1978 - 1989
Porsche 911 Carrera 3.2L 1984 - 1989
Porsche 964 Turbo 3.3L 1991 - 1992
Porsche 964 Turbo 3.6L 1993 - 1994

Diagram ref. no. 5A

The exhaust manifold stud forms a critical fastening point that holds the exhaust manifold (or heat exchanger) firmly to the engine’s cylinder head. It ensures the exhaust system components remain tightly seated under heat, vibration, and thermal cycling, preventing exhaust leaks and preserving engine performance.

This stud’s threaded design enables secure engagement with corresponding nuts and manifold flanges. By maintaining proper clamping force, it helps support the manifold gasket and metal mating surfaces, sustaining a leak-free joint under extreme exhaust temperatures and repeated heating/cooling cycles.

Exhaust studs undergo intense heat and stress, which over time can lead to stretching, thread wear, or breakage. A compromised stud can allow exhaust leaks, reduce engine efficiency, and make future removal of the manifold difficult. Replacing them restores correct fit, proper torque retention, and long-term exhaust system reliability.

When to replace:
•  Studs show corrosion, thread wear, or distortion
•  One or more studs have broken during removal
•  Exhaust leak noises at the manifold flange
•  During manifold gasket replacement
•  Preventive renewal during engine or exhaust overhaul

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

99906223903
99906223902
99906223903

The product you are viewing cross references to these numbers
Titanium exhaust head stud kit. Porsche 911 / 930 Turbo (L 45mm) - 99906223902, 99908400201/2, 99908400201, 99906223903 - SL-TI-122
1
Titanium exhaust head stud kit. Porsche 911 / 930 Turbo (L 45mm)
SL-TI-122
Product Information
Product Information
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.

silverlake

Novel ultra-high-performance product
• Use of Titanium Ti6Al4V technology
• Extreme perceived quality

Contains 12 x Studs, Nuts & Washers

Fits:
Porsche 911 3.0L SC
Porsche 911 3.2L 1984-89
Porsche 930 turbo
Porsche 965 turbo

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

SL-TI-122
99906223902
99908400201
99908400201
99906223903

The product you are viewing cross references to these numbers
DISPLAYING 1 to 10 (of 10 products)
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About Exhaust Nuts / Bolts / Studs

Exhaust Nuts, Bolts & Studs for Porsche | Secure Fitment for High-Performance Exhaust Systems

Your Porsche’s exhaust system operates under extreme heat, vibration, and pressure — making durable fasteners like exhaust nuts, bolts, and studs essential for reliability and safety. These components secure exhaust manifolds, catalytic converters, mufflers, and pipes together, maintaining a tight seal and precise alignment throughout the system.

At Design911, we offer a wide selection of standard and precision-engineered exhaust fasteners designed to meet or exceed manufacturer specifications. Made from heat-resistant, corrosion-proof materials, these nuts, bolts, and studs ensure long-lasting performance, perfect fitment, and effortless installation for both standard and performance exhaust systems.

Whether you’re rebuilding a classic 911 or servicing a modern Porsche GT model, our high-strength exhaust fixing hardware provides superior durability and resistance to loosening under thermal cycling.

What Do Exhaust Nuts, Bolts & Studs Do?

These components are the backbone of the exhaust system’s structural integrity. They keep all exhaust sections securely connected, ensuring no movement or leaks under load.

Core Functions:

  • Secure exhaust joints and flanges between manifolds, catalytic converters, and pipes.
  • Maintain consistent exhaust pressure by preventing gaps or misalignment.
  • Reduce vibration and mechanical stress.
  • Enable easy serviceability for exhaust maintenance or upgrades.
  • Ensure safe operation under high heat and pressure.

Without robust fasteners, even the most advanced exhaust systems can suffer from leaks, rattling, or part failure — leading to reduced performance and increased emissions.

Why Do Exhaust Fasteners Fail?

Exhaust nuts, bolts, and studs operate in one of the harshest environments in a vehicle. Over time, exposure to heat, moisture, and vibration can degrade even the strongest materials.

Common Causes of Failure Include:

  • Corrosion or rust from moisture and road salt.
  • Thermal expansion causing loosening or cracking.
  • Over-torquing during installation.
  • Metal fatigue from repeated heating and cooling cycles.
  • Cross-threading or thread stripping during servicing.

When fasteners fail, exhaust leaks, rattling, and poor gas flow can occur — impacting performance, sound, and emissions compliance.

Why Replace or Upgrade Your Exhaust Fasteners?

Replacing worn or rusted exhaust hardware is vital for ensuring the longevity and reliability of your Porsche’s exhaust system.

Key Benefits:

  • Restores exhaust system integrity and secure fitment.
  • Prevents leaks, rattles, and misalignment. Improves exhaust flow and performance reliability.
  • Crafted from high-strength stainless steel or coated alloy.
  • Direct-fit compatibility for Porsche 911, Cayman, Boxster, Panamera & Macan.
  • Ideal for both restoration and performance applications.

High-quality fasteners not only provide peace of mind during installation but also withstand years of performance driving without corrosion or seizing.

Highlights:

  • Premium exhaust nuts, bolts & studs for Porsche vehicles.
  • Designed for high-heat, high-vibration environments.
  • Prevents leaks and loosening in the exhaust system.
  • Heat- and corrosion-resistant stainless steel construction.
  • Ideal for rebuilds, upgrades, or performance tuning.
  • Precision-engineered to manufacturer standards.

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