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- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
- Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
- Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
- Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman T 718 2.0L Manual (300 Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
Set of 12 studs and 12 M8 nuts
Fits:
- Porsche Boxster 718 2.0L Manual (300 Bhp)
- Porsche Boxster 718 2.0L PDK (300 Bhp)
- Porsche Boxster S 718 2.5L Manual (350 Bhp)
- Porsche Boxster S 718 2.5L PDK (350 Bhp)
- Porsche Boxster T 718 2.0L Manual (300 Bhp)
- Porsche Boxster T 718 2.0L PDK (300 Bhp)
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman 718 2.0L Manual (300Bhp)
- Porsche Cayman 718 2.0L PDK (300Bhp)
- Porsche Cayman S 718 2.5L Manual (350Bhp)
- Porsche Cayman S 718 2.5L PDK (350Bhp)
- Porsche Cayman T 718 2.0L Manual (300Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
Replaces diagram ref no 3
This premium cylinder head to manifold titanium stud and nut kit is the ultimate solution for future-proofing your exhaust system. Manufactured from Grade 5 Ti6Al4V titanium, these fasteners offer exceptional strength comparable to steel while delivering an impressive 40% weight reduction. Titanium also provides natural corrosion resistance, ensuring the studs and nuts will not rust, seize or degrade even after repeated heat cycles and long-term exposure to extreme engine bay conditions.
Perfect for performance upgrades, engine rebuilds, exhaust overhauls or preventative maintenance, this titanium stud kit guarantees reliability, serviceability and long-lasting durability.
What Titanium Cylinder Head to Manifold Studs & Nuts Do
These titanium fasteners play a crucial role in exhaust
system performance and reliability:
- Secure
the exhaust manifold to the cylinder head under high heat and
vibration
- Maintain
consistent clamping force, preventing exhaust leaks
- Provide
excellent thermal stability, resisting heat cycling fatigue
- Reduce
overall hardware weight, improving performance and serviceability
- Prevent
corrosion, avoiding seized or snapped studs during future maintenance
- Support performance exhaust systems with high-strength, precision-threaded hardware
This kit delivers superior fastening strength and long-term exhaust sealing.
Why Standard Exhaust Studs Commonly Fail
Conventional steel exhaust studs operate in harsh
environments where heat, moisture and vibration accelerate deterioration.
Common failure causes include:
- Rust
and corrosion, especially in older or high-mileage vehicles
- Stud
seizure, making removal extremely difficult
- Thermal
expansion fatigue, weakening the metal over time
- Shearing
or snapping, often during exhaust servicing
- Material
degradation from repeated heat cycles
- Exposure to salt and moisture, especially in winter climates
These failures can lead to exhaust leaks, poor performance, broken studs in the cylinder head and costly repair work.
Why You Should Replace Them with Titanium Studs & Nuts
Switching to high-grade titanium fasteners ensures exceptional long-term performance and eliminates common exhaust hardware issues.
Key benefits include:
- Rust-proof
performance, even after years of heat cycling
- As
strong as steel but 40% lighter thanks to Ti6Al4V alloy construction
- Reduced
risk of stud seizure, making future exhaust removal easier
- Improved
durability, especially on tuned or high-temperature engines
- Enhanced
thermal stability, maintaining clamping force under extreme heat
- Ideal
for performance exhaust systems, turbocharged engines and track-driven
vehicles
- Future-proofing your engine bay, saving time and money on future repairs
For any rebuild, upgrade or exhaust replacement, these titanium studs are a significant and smart improvement over traditional fasteners.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M7182025SPYTISTUDHEAD
The product you are viewing cross references to these numbers
- 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 Bolt M8x40
Sold each
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
Diagram ref no 9
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90007428203
The product you are viewing cross references to these numbers
- 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
M8 Exhaust Nut - M8
Sold each and used throughout
The Porsche M8 Exhaust Nut is a high-quality
replacement fastener used in various positions across Porsche exhaust systems.
Designed to secure exhaust components such as manifolds, heat exchangers,
silencers, brackets and connecting flanges, this nut helps maintain correct
clamping force and reliable exhaust sealing.
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 nuts operate in extremely harsh conditions, exposed to heat cycles, vibration, moisture, road salt and corrosion. Over time, original nuts can seize, round off, strip or weaken, making removal difficult and reducing their ability to hold exhaust components securely.
Replacing worn exhaust hardware during servicing or restoration helps ensure a secure, leak-free and professional exhaust installation.
What Does an Exhaust Nut Do?
An exhaust nut fastens exhaust components to studs or bolts, holding joints tightly together and helping maintain gasket compression.
A correctly fitted exhaust nut helps provide:
- Secure exhaust component mounting
- Proper gasket sealing
- Reduced risk of exhaust leaks
- Correct exhaust alignment
- Improved resistance to vibration
- Long-term exhaust system reliability
Symptoms of Wear or Failure
Common signs that an exhaust nut may need replacement
include:
- Rust or heavy corrosion
- Rounded or damaged edges
- Stripped threads
- Seized nut during removal
- Loose exhaust joints
- Exhaust blowing noises
- Rattling or vibration from the exhaust
- Soot marks around exhaust flanges
- Inability to tighten to the correct torque
Why Replacement Matters
Replacing worn or corroded exhaust nuts helps prevent exhaust leaks, loose components and future repair difficulties.
Benefits include:
- Restores secure exhaust fastening
- Helps prevent exhaust leaks
- Improves gasket sealing
- Reduces vibration and rattles
- Makes future maintenance easier
- Supports reliable exhaust repairs
- Protects surrounding exhaust components
- Improves restoration quality
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90091009701
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97
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
The product you are viewing cross references to these numbers