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Exhaust Nuts / Bolts / Studs

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DISPLAYING 1 to 5 (of 5 products)
Special Offer
TITANTORXLONG12
Product Information
Product Information
Titanium exhaust manifold bolt M8x27. 
Set of 12  (OE Ref: 99907358901) 

rohler

Titanium is a highly corrosion-resistant material, which is particularly important in exhaust systems due to the exposure to extreme heat and moisture. The corrosion resistance of titanium bolts ensures longevity and reduces the risk of premature failure, ultimately saving the owner from costly repairs.

Fits:
Porsche 986 Boxster 1997-2004
Porsche 987 Boxster 2005-2008
Porsche 987C Cayman 2006-2008
Porsche 996 Carrera 1998-2004
Porsche 997.1 Carrera 2005-2008
Porsche 718 (982) Boxster 2017-2021
Porsche 718 (982C) Cayman 2017-2021


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Diagram ref no 3



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TITANTORXLONG12
99907358901
99907507400
90037813100
99907507100
9990750710A

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Special Order item
99907358901
Product Information
Product Information
Exhaust manifold bolt M8x27. Sold individually. 
12 required per car.

porsche

Fits:
Porsche 982 Boxster 2017-2021
Porsche 982C Cayman 2017-2021

Porsche 991 Turbo / Turbo S / GT2RS  2014-2020


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Diagram ref no 3



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Related, superseded, cross reference or alternative numbers for comparison.

99907358901
982251235A

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Special Order item
PAF007634
Product Information
Product Information
Exhaust manifold Hexagon flange nut, self-locking, M8
Sold each.

porsche

Fits:
Porsche 982 Boxster 2017>>
Porsche 982 Boxster Spyder 2019>>
Porsche 982C Cayman 2017>>
Porsche 982C Cayman GT4 2019>>
Porsche 991.2 Carrera 2017-19
Porsche 991 GT3 RS / Speedster 2014-21
Porsche 992.1 Carrera 2019>>
Porsche 992 Turbo 2020>>
Porsche 992 GT3 2021>>
Porsche 95B.2 Macan 3.0L / 3.6L 2014-18
Porsche 955 Cayenne 4.5L 2003-06 (T90 / T91 Engines)
Porsche 957 Cayenne 4.8L 2007-10
Porsche 958 Cayenne 3.6L / 4.8L 2011-18

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Diagram ref no 5

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PAF007634
PAF007634
99908464202

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Special Offer
PAF007634T
Product Information
Product Information
Exhaust manifold Hexagon flange nut, self-locking, M8   Titanium
Sold each.

rohler

Fits:
Porsche 982 Boxster 2017>>
Porsche 982 Boxster Spyder 2019>>
Porsche 982C Cayman 2017>>
Porsche 982C Cayman GT4 2019>>
Porsche 991.2 Carrera 2017-19
Porsche 991 GT3 RS / Speedster 2014-21
Porsche 992.1 Carrera 2019>>
Porsche 992 Turbo 2020>>
Porsche 992 GT3 2021>>
Porsche 95B.2 Macan 3.0L / 3.6L 2014-18
Porsche 955 Cayenne 4.5L 2003-06 (T90 / T91 Engines)
Porsche 957 Cayenne 4.8L 2007-10
Porsche 958 Cayenne 3.6L / 4.8L 2011-18

Click 'Zoom in' for large parts diagram.
Diagram ref no 5

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PAF007634T
PAF007634
99908464202

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Special Offer
9M718TISTUD
Product Information
Product Information
Titanium stud and nut kit, 
Set of 10 studs and 10 M8 nuts

Fits:
Porsche 718 Boxster Spyder - 2019 to 2024
Porsche 718 Boxster GTS 4.0ltr - 2020 to 2024
Porsche 718 Cayman GT4 - 2019 to 2024
Porsche 718 Cayman GTS 4.0ltr - 2020 to 2024

9m 718 GT4/Spyder/GTS OPF to silencer titanium stud kit

This is the ideal solution to future proof your exhaust studs from the OPF pipes to exhaust silencer as they are resistant to corrosion.
Our Titanium alloy studs and nuts will not rust after repeated heat cycles and are constructed from Grade 5 Ti6Al4V titanium, as strong as steel, but 40% lighter.

Click 'Zoom in' for large parts diagram.
Nuts replace diagram ref no 12
Studs fit on diagram ref 8 and 9




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9M718TISTUD
PAF007637

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DISPLAYING 1 to 5 (of 5 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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