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 +443456003478 https://www.design911.co.uk Facebook Instagram
Porsche specialists based in the UK
Porsche > 924 (1977-1988) > 924 2.0L 1976-79 > Exhausts >

Exhaust Nuts / Bolts / Studs

Exhaust Nuts / Bolts / Studs

Filter by brand
DISPLAYING 1 to 4 (of 4 products)
Heat Exchanger Hexagon Bolt Nut. Porsche 911 69-77 / 914 / 924 - 99908400202
3
Heat Exchanger Hexagon Bolt Nut. Porsche 911 69-77 / 914 / 924
99908400202
Product Information
Product Information

Heat Exchanger Hexagon Nut – M10
Sold each

Ensure a secure and reliable exhaust installation with this Heat Exchanger Hexagon Nut. Manufactured to original equipment specifications, this high-quality replacement hexagon nut is used to securely fasten the heat exchanger to the engine's exhaust studs, ensuring a tight, leak-free connection.

Fits:

  • Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 924 2.0L 1976-79
  • Porsche 914 (1970-1976)

Diagram ref no 7

Heat exchanger mounting hardware is continually exposed to extreme exhaust temperatures, moisture, road salt and vibration. Over time, the original nuts can corrode, seize or lose their clamping force, making removal difficult and increasing the risk of exhaust leaks. Replacing worn or damaged hardware whenever the exhaust system is removed is considered best practice for both servicing and restoration work.

Manufactured from durable, corrosion-resistant materials, this OE Match hexagon nut provides dependable clamping force and long service life, making it ideal for routine maintenance, exhaust repairs and concours restorations.

What Does the Heat Exchanger Hexagon Nut Do?

The hexagon nut secures the heat exchanger to the cylinder head via the exhaust studs.

Its primary functions include:

  • Securing the heat exchanger firmly in position.
  • Maintaining correct gasket compression.
  • Preventing exhaust gas leaks.
  • Resisting loosening caused by vibration and heat cycling.
  • Supporting proper exhaust alignment.
  • Helping maintain engine performance and efficiency.

Correctly tightened exhaust hardware is essential for a safe and reliable exhaust system.

Why Should the Heat Exchanger Nut Be Replaced?

Exhaust mounting hardware operates under extremely demanding conditions.

Common reasons for replacement include:

  • Corrosion caused by moisture and road salt.
  • Heat cycling leading to material fatigue.
  • Seized or rounded nuts during removal.
  • Damaged threads.
  • Reduced clamping force.
  • Exhaust system restoration.
  • Heat exchanger replacement.

Replacing the hardware during exhaust work helps avoid future maintenance issues and ensures a secure installation.

Symptoms of Worn or Damaged Exhaust Hardware

Typical signs include:

  • Rusted or heavily corroded nuts.
  • Seized fixings.
  • Exhaust leaks.
  • Loose heat exchanger.
  • Rattling exhaust components.
  • Broken or damaged fasteners.
  • Difficulty removing existing hardware.

Renewing the mounting hardware helps restore the integrity of the complete exhaust system.

When Should the Heat Exchanger Hexagon Nut Be Replaced?

Replacement is recommended whenever:

  • Heat exchangers are removed.
  • Exhaust gaskets are replaced.
  • Exhaust manifold repairs are carried out.
  • Engine rebuilds are performed.
  • Restoring a classic Porsche.
  • Existing nuts show signs of corrosion or damage.

Installing new hardware during reassembly helps ensure reliable sealing and long-term durability.



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

99908400202
99908400202

The product you are viewing cross references to these numbers
Heat exchanger hexagon bolt. Porsche 911 69-77 / 914 / 924 - 90007514802, 9000751480Y, 0057103, 90007514803
1
Heat exchanger hexagon bolt. Porsche 911 69-77 / 914 / 924
Special Order item
90007514803
Product Information
Product Information
Hexagon headed heat exchanger bolt to muffler.

Fits:
Porsche 911 1969 - 1977
Porsche 914-6 1970 - 1976
Porsche 924 1976 - 1979

Diagram ref no 6

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

90007514803
90007514802
9000751480Y
0057103
90007514803

The product you are viewing cross references to these numbers
Heat exchanger hexagon bolt. Porsche 911 69-77 / 914 / 924 - 90007514802, 9000751480Y, 90007514803
4
Heat exchanger hexagon bolt. Porsche 911 69-77 / 914 / 924
90007514803/1
Product Information
Product Information
Hexagon headed heat exchanger bolt to muffler.

Fits:
Porsche 911 1969 - 1977
Porsche 914-6 1970 - 1976
Porsche 924 1976 - 1979

Diagram ref no 6

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

90007514803
90007514802
9000751480Y
90007514803

The product you are viewing cross references to these numbers
Hex Head Bolt M8 x 16. Porsche 911 / 914 / 924 / 928 - 90007508702, 90007508703, 90007508704
1
Hex Head Bolt M8 x 16. Porsche 911 / 914 / 924 / 928
Special Order item
90007508704
Product Information
Product Information
Hex Head Bolt M8 x 16 used in various locations

Sold each

Fits:

  • Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
  • 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
  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1989 3.3L Turbo (930)
  • Porsche 924 2.0L 1976-79
  • Porsche 924 2.0L 1980-85
  • Porsche 924 Turbo 2.0L 1979-81
  • Porsche 924 Turbo 2.0L 1982-84
  • Porsche 924 Carrera GT 2.0L 1981
  • Porsche 924 Carrera GTS 2.0L 1982
  • Porsche 924S 2.5L 1986-87
  • Porsche 924S 2.5L 1988
  • Porsche 928 4.5L 1978-82
  • Porsche 928S 4.7L 1981-83
  • Porsche 928S2 4.7L 1984-86
  • Porsche 928S4 5.0L 1987-92
  • Porsche 928GT 5.0L 1989-91
  • Porsche 928GTS 5.4L 1992-95
  • Porsche 914 (1970-1976)

The Hex Head Bolt M8 x 16 is a versatile, high-strength fastener used in multiple locations across classic Porsche models—including the Porsche 911, 914, 924 and 928. As a critical component in securing brackets, covers, engine parts, underbody panels and suspension-related hardware, this bolt ensures structural integrity and reliability throughout the vehicle.

What This Bolt Does

The Hex Head Bolt M8 x 16 plays a crucial role in securing various mechanical and body components on a Porsche.

Common Functions

  • Secures brackets, panels and trim pieces
  • Anchors engine and drivetrain components
  • Holds suspension hardware and mountings
  • Fastens interior and underbody parts
  • Provides structural rigidity where load-bearing fasteners are required       



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

90007508704
90007508702
90007508703
90007508704

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
Also found on these pages
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.

You may also like
Popular Models