Exhaust Nuts / Bolts / Studs

Mounting Kit For Exhaust.

The Porsche Exhaust Mounting Kit – OE Match (Part Number: PCG91121100/1) is a replacement fitting and fastening kit designed to securely install and support the exhaust heat exchangers on selected classic Porsche 911 models.

Fits:

• Porsche 911 2.7L / 3.0L / *3.2L 08/73-07/85

*If used with 1984 onwards 3.2L you may need 6x 93011119112/1 42mm bore Manifold gaskets 

Designed as an alternative to the original Porsche exhaust mounting kit, this OE Match replacement provides the necessary mounting hardware for correctly securing compatible exhaust components, helping maintain a stable installation and reliable sealing at the exhaust connections.

The exhaust mounting system operates in an extremely demanding environment, exposed to high temperatures, constant engine vibration, moisture and road contamination. Over time, original mounting bolts, nuts, studs and other fastening components can become corroded, weakened, seized or damaged during exhaust removal.

Replacing worn or deteriorated exhaust mounting hardware helps maintain secure exhaust connections, minimise unwanted vibration and reduce the likelihood of exhaust gas leaks.

Ideal for exhaust system repairs, heat exchanger replacement, engine maintenance and classic Porsche restoration projects, this OE Match mounting kit offers a practical and cost-effective alternative to Genuine Porsche-branded mounting hardware.

What This Product Does:
The exhaust mounting kit provides the fastening components required to securely attach compatible exhaust heat exchangers and associated exhaust components to the engine.

Correctly installed exhaust mounting hardware maintains the clamping force required for secure connections and effective sealing between the exhaust components and the cylinder heads.

Its main functions include:

• Securing exhaust components: Provides the mounting hardware needed to correctly fasten heat exchangers and associated exhaust fittings.
• Maintaining exhaust joint sealing: Helps apply consistent clamping pressure to the exhaust gaskets, reducing the risk of exhaust gas leakage.
• Supporting exhaust system stability: Keeps exhaust components correctly positioned during engine operation.
• Reducing vibration and rattling: Helps prevent unwanted movement caused by loose or deteriorated fasteners.
• Withstanding high operating temperatures: Provides mounting hardware suitable for the demanding thermal conditions surrounding the exhaust system.
• Supporting reliable exhaust performance: Maintains secure exhaust connections for effective exhaust gas flow.
• Facilitating exhaust repairs: Provides replacement fastening components during heat exchanger installation, exhaust maintenance or engine restoration.

Symptoms Of Wear Or Failure:
Exhaust mounting hardware is continually subjected to extreme temperatures, repeated heating and cooling cycles, engine vibration and exposure to moisture. These conditions can cause corrosion, metal fatigue, loosening or seizure over time.

Common signs of worn or damaged exhaust mounting components include:

• Corroded or rusted fasteners: Exhaust mounting nuts, bolts and studs may become heavily corroded, reducing their strength and making removal difficult.
• Loose exhaust components: Deteriorated or incorrectly tightened hardware may allow movement around the heat exchanger or exhaust connections.
• Exhaust gas leaks: Damaged or loose fasteners can reduce gasket clamping pressure, allowing exhaust gases to escape from the joints.
• Increased exhaust noise: Leaking exhaust connections may produce ticking, blowing or hissing sounds, particularly during acceleration or when the engine is cold.
• Rattling or vibration: Loose mounting components may allow the exhaust system to vibrate excessively, producing unwanted metallic noises.
• Broken or missing mounting hardware: Heat exposure, corrosion or mechanical stress may cause mounting studs or bolts to fracture.
• Exhaust fumes or unusual odours: Leaking exhaust joints may allow exhaust gases to escape into the surrounding engine area.
• Difficulty removing exhaust components: Severely corroded or seized mounting hardware may complicate routine servicing and heat exchanger replacement.

Why Replacement Matters:
Replacing deteriorated exhaust mounting hardware is important for maintaining the structural integrity, sealing performance and long-term reliability of the Porsche 911 exhaust system.

Old or corroded mounting components may no longer provide the correct clamping force required to keep exhaust connections secure. This can result in exhaust gas leaks, excessive vibration, rattling and potential damage to surrounding components.

Severely corroded hardware may also break during removal, making future exhaust repairs more difficult and time-consuming.

Installing a replacement OE Match Exhaust Mounting Kit helps to:

• Restore secure exhaust installation: Ensure compatible heat exchangers and exhaust components are correctly fastened.
• Help prevent exhaust leaks: Maintain appropriate gasket clamping pressure for reliable sealing.
• Reduce unwanted vibration: Minimise rattling and movement caused by loose or weakened mounting hardware.
• Improve exhaust system reliability: Replace aged, corroded or damaged fasteners before they cause further problems.
• Support safe vehicle operation: Help reduce the risk of exhaust gases escaping through poorly secured connections.
• Simplify exhaust maintenance: Provide replacement mounting hardware when removing and refitting heat exchangers.
• Protect surrounding components: Reduce the risk of excessive movement or stress on adjacent exhaust components.
• Support classic Porsche restoration: Restore the intended exhaust mounting arrangement during engine rebuilding or vehicle refurbishment.
• Offer a cost-effective repair: Provide an OE Match alternative to the Genuine Porsche mounting kit.

Replacing exhaust mounting hardware during heat exchanger replacement or major exhaust servicing is recommended, particularly when existing fasteners show signs of corrosion, damage or deterioration.

Related reference numbers
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PCG91121100

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Hex Head Bolt M8 x 16 used in various locations

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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       

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90007508704

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Mounting kit with 3 straps, 1 gasket, bolts & nuts for rear exhaust.

Fits:
Porsche 911 Carrera 3.2 08/83-07/89
Porsche 911 SC/911 Carrera 2.7-3.0 08/75-07/83

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1621702010

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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
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PCG012231A

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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.

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

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SL-TI-122

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