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Porsche // 911 & 912 (1965-1989) // 911 1978-1983 3.0L / SC
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Brackets / Clamps / Straps
- 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
Fits:
Porsche 911 1965-83
Click 'Zoom in' for large parts diagram.
Diagram ref no 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90111115704
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
stainless steel. SSI quality.
Fits:
Porsche 911 1965-83
Click 'Zoom in' for large parts diagram.
Diagram ref no 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90111115704
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
Fits:
Porsche 911 1974-84
*If using with 1985 onwards 3.2L you may need 6x 93011119112 42mm bore Manifold gaskets
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG91121100
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
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
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
Related, superseded, cross reference or alternative numbers for comparison.
PCG91121100
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
Fits:
Porsche 911 Carrera 3.2 08/83-07/89
Porsche 911 SC/911 Carrera 2.7-3.0 08/75-07/83
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1621702010
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
Need 2 per car. Price shown is for each.
Upgrade your classic Porsche 911 with the Titanium Exhaust Silencer Strap. This strap secures the rear silencer (muffler) to the chassis, helping keep the exhaust system solidly mounted. The titanium version retains the exact fit of the original while offering superior strength, corrosion resistance, and lighter weight — perfect for restoring your 911 or improving long-term reliability.
Fits:
Porsche 911 1965 - 1983
Diagram ref no 20
Made to handle heat, road vibration, and exposure to elements, the titanium strap prevents the muffler from sagging or vibrating excessively. If the original stainless or steel strap is rusted, loose, or damaged, this titanium upgrade will restore secure mounting, reduce noise, and protect other exhaust and chassis components from damage.
Why replacing it matters:
If you leave a worn strap in place: the muffler may drop or become misaligned, leading to vibrations, noise, or even exhaust contacting underbody parts. Over time, this can damage hangers, exhaust joints, or brackets, potentially causing exhaust leaks or more significant repairs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90111115704T
The product you are viewing cross references to these numbers
Exhaust Mounting Brackets, Straps & Clamps – Secure, Silent & Strong
A Porsche exhaust system relies on more than just pipes and silencers — it’s held together by a network of mounting brackets, straps, and clamps that keep everything securely in place. These essential components absorb vibration, maintain correct alignment, and prevent stress or damage to exhaust pipes and mufflers.
At Design911, we stock a full range of exhaust mounting hardware, including brackets, hangers, straps, clamps, gaskets, and fasteners, all designed for long-lasting durability and a perfect fit. Built from high-strength stainless steel and corrosion-resistant materials, these components ensure your exhaust system remains properly supported and free from unwanted noise or movement.
Whether you’re performing a full exhaust replacement or a minor repair, replacing worn or rusted mounting hardware restores proper fitment and protects your Porsche’s exhaust from damage caused by vibration or misalignment.
What Do Exhaust Mounting Brackets, Straps & Clamps Do?
These small but vital parts provide the backbone for your exhaust system’s stability and integrity.
Core Functions:
- Secure
the exhaust system to the vehicle chassis.
- Maintain
correct alignment to prevent strain on joints and flanges.
- Absorb
engine vibration to reduce stress and cracking.
- Ensure
leak-free connections between pipes and silencers.
- Prevent rattling and unwanted noise during acceleration and cornering.
Without properly functioning brackets and clamps, your exhaust can sag, vibrate, or even detach — risking costly damage and performance loss.
Why Do Exhaust Mounts and Clamps Fail?
Constant heat, vibration, and exposure to the elements make exhaust mounting components prone to wear over time.
Common Causes of Failure Include:
- Corrosion
or rust from road salt and moisture.
- Metal
fatigue caused by heat cycling and vibration.
- Cracked
or stretched straps from repeated stress.
- Loose
or broken clamps leading to exhaust leaks.
- Rubber mount deterioration resulting in noise or exhaust movement.
Failure of these components can lead to exhaust misalignment, rattling, leaks, or premature pipe damage — issues that worsen quickly if ignored.
Why Replace Components?
Replacing worn or damaged exhaust mounting hardware ensures your Porsche’s exhaust system remains stable, quiet, and free-flowing.
Key Benefits:
- Restores exhaust alignment and fitment.
- Prevents damage to mufflers, pipes, and joints.
- Eliminates rattling, vibration, and leaks.
- Durable stainless steel and heat-resistant construction.
- Direct-fit
compatibility for all Porsche models, classic and modern.
- Ideal for maintenance, restoration, or performance upgrades.
A secure exhaust system not only improves comfort and performance but also extends the life of other components — ensuring your Porsche remains refined and reliable.
Highlights:
- High-quality exhaust brackets, clamps, and mounting straps.
- Precision-engineered for Porsche fitment and durability.
- Prevents vibration, movement, and exhaust leaks.
- Made from corrosion-resistant stainless steel.
- Perfect for restorations or exhaust maintenance.
- Ensures long-term stability and quiet operation.