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Porsche SSI Exhausts
Are you backdating a 3.2 Carrera or 3.2ltr engine?
Use this twin outlet exhaust and SSi heat exchanger package to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, two out" system.
Porsche 911 1984-89 3.2L
SSI Heat Exchangers & SSI Twin Outlet Rear Silencer/Muffler
Powerful straight though system all Stainless steel parts, offering more bhp and a fuller sound.
Kit Includes:
- 1 x Twin outlet rear silencer (SSI)
- 2 x heat exchangers, (SSI)
- 2 x oil pipes
- 8 x gaskets.
- 2 x silencer straps.
Please note the heating system will need to be re-worked so extra parts are included 1 x heater splitter box and 2 x heater hoses.
For more information about this product Click Here
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Fits:
Porsche 911 Carrera 3.2L 08/83-07/89
Porsche 911 SC / 911 Carrera 2.7L-3.0L 08/75-07/83
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620611800
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
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Carrera Sport 3.2L 08/1983-07/1989
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620611600
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Carrera Sport 3.2L 08/1983-07/1989
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620611700
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 2.7L-3.3 08/1973-07/1986
Diagram ref 20.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91165911901
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
- Porsche 911 1975-1977 3.0L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
Are you backdating a 3.2 Carrera or 3.2ltr engine?
Use these SSi heat exchangers to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, one out" system seen on the early, pre impact bumper cars.
Made using Ø41 mm outside tubing for a better flow and performance these AISI 321/EN4531 titanium stabilized stainless steel heat exchangers offer long life, increased power output and a quality fit.
Price is for a SET OF 2
Fits:
Porsche 911 (Conversion) 3.2ltr 08/1983 - 07/1989
Core Length: 470 mm
Core Width: 760 mm
Core Depth: 380 mm
Outer diameter: 41 mm
LONG LIFE
Made using AISI 321/EN4531 titanium stabilized stainless steel the expected life in the severest road conditions (salt) is 20-30 years.
HIGHER POWER OUTPUTOutput is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.
CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the by products of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1623106810
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
Shop Securely
12 Month Warranty
Worldwide Delivery
Are you carrying out an engine swap to fit a 964 / 993 3.6ltr to an early 911?
Use these SSi heat exchangers to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, one out" system seen on the early, pre impact bumper cars.
Made using Ø41 mm outside tubing for a better flow and performance these AISI 321/EN4531 titanium stabilized stainless steel heat exchangers offer long life, increased power output and a quality fit.
IMPORTANT: Major modification needed on engine tin ware when installing on 3,6ltr engines.
Price is for a SET OF 2
Fits:
Porsche 911 (Conversion) 3.6ltr 01/1963 - 07/1989
Core Length: 470 mm
Core Width: 750 mm
Core Depth: 370 mm
Outer diameter: 41 mm
LONG LIFE
Made using AISI 321/EN4531 titanium stabilized stainless steel the expected life in the severest road conditions (salt) is 20-30 years.
HIGHER POWER OUTPUTOutput is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.
CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the byproducts of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1623107110
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
Shop Securely
12 Month Warranty
Worldwide Delivery
Are you backdating a 3.2 Carrera or 3.2ltr engine?
Use these SSi heat exchangers to solve the exhaust requirements by deleting the pre-silencer and turning the rear silencer into a "two in, one out" system seen on the early, pre impact bumper cars.
Fits:
Porsche 911 3.2L Conversion SSI
*Oil pipes 91110772910 and 91110773910 are also required also see our exhaust packages
Modification is needed on the engine tinware when installing on 3.2ltr engines.
LONG LIFE
Made using AISI 321/EN4531 titanium stabilized stainless steel the expected life in the severest road conditions (salt) is 20-30 years.
HIGHER POWER OUTPUT
Output is increased particularly in the low and middle RPM ranges. The design makes power by minimizing intake charge disturbances at valve overlap, and increasing the exhaust gas extraction effect. The volumetric efficiency, and thereby the power output is increased. The SSI headers are significantly improved versions of the basic header design used by Porsche on all normally aspirated six cylinder competition engines.
CARBON MONOXIDE SAFE
Unlike all other aftermarket heat exchangers, the SSI heat exchanger headers are made to minimize the possibility that engine produced acids will internally corrode the enclosed primary tubes, thereby allowing carbon monoxide to enter the passenger compartment. The AISI 304 stainless steel tubing is highly resistant to the byproducts of combustion. SSI use only one piece primary tubes, eliminating the possibility of hand-made welds cracking, and the resulting carbon monoxide leaks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91133091917SSI
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
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12 Month Warranty
Worldwide Delivery
Stainless steel. Left or Right - Please select below.
G50 cars only
Fits:
Porsche 911 1987-89 3.2L
Porsche 930 TURBO 1987-89 3.3L
Please note the flaps don't come with holes to accommodate caloric sensor. You may need to drill the holes for the rivets.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91121101
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
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 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
Shop Securely
12 Month Warranty
Worldwide Delivery
Sports exhaust conversion kit without catalytic converters.
Fits:
Porsche 911 3.2 Carrera - 1984 to 1989
Material: AISI304 Stainless Steel
Number of Inlets / Outlets: 2/2
Upgrade your 3.2-litre Carrera engine with our high-performance free-flow exhaust system. Designed to deliver a significant boost in horsepower, this system features Ø41mm OD pipework and a Ø60mm inflow for optimal power output. Engineered for precision, it integrates seamlessly with standard G-model tinware, eliminating the need for additional replacements.
Equipped with O2 sensors on both sides and twin Ø70mm tailpipes, the system not only enhances engine performance but also delivers a richer, more dynamic exhaust note.
Constructed entirely from robust AISI304 stainless steel, this system is built for durability and long-lasting performance. Its precision design ensures perfect compatibility and hassle-free installation, making it the ideal choice for enthusiasts seeking to elevate their engine's capabilities without major modifications.
- Instant Performance Gains: A noticeable boost without complicated installs.
- Amazing Sound: This system doesn't just improve performance—it delivers an aggressive, powerful sound.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620802710
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 3.2ltr - 1984 to 1989
Material: Stainless Steel
Number of Inlets / Outlets: 2/1
Conversion of a performance optimised 3.2ltr Carrera engine into a free-flow system.
This system is specifically engineered to generate increased HP from an enhanced engine by using Ø41mm OD pipework in combination with Ø60mm inflow to the exhaust.
No need to replace the engine tinware as system design allows to fit with standard G-model tinware.
O2 sensor on both left and right side and all made in AISI304 stainless steel.
Tail pipe outlet Ø70mm for optimizing the sound outlet from the system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620802610
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 3.2ltr 08/1983-07/1989
Material: AISI304 Stainless Steel
Number of Inlets / Outlets: 2/1
Conversion of a performance optimized 3.2 Carrera engine into a free-flow system. This system is specifically engineered to generate increased HP from an enhanced engine by using Ø41mm OD pipework in combination with Ø60mm inflow to the exhaust. O2 sensor (Lambda) fitted to both left and right side.
Made from AISI304 stainless steel, there is no need to replace or modify the engine tinware as system design allows to fit with standard G-model tinware.
The tail pipe outlet is Ø70mm for optimising the exhaust sound from this system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620802310
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 3.2ltr 08/1983-07/1989
Material: AISI304 Stainless Steel
Number of Inlets / Outlets: 2/2
Conversion of a performance optimized 3.2 Carrera engine into a free-flow system. This system is specifically engineered to generate increased HP from an enhanced engine by using Ø41mm OD pipework in combination with Ø60mm inflow to the exhaust. O2 sensor (Lambda) fitted to both left and right side.
Made from AISI304 stainless steel, there is no need to replace or modify the engine tinware as system design allows to fit with standard G-model tinware.
Tail pipe outlet is Ø70mm for optimizing the sound from this system.
- Instant Performance Gains: A noticeable boost without complicated installs.
- Amazing Sound: This system doesn't just improve performance—it delivers an aggressive, powerful sound.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620802810
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Shop Securely
12 Month Warranty
Worldwide Delivery
Porsche SSI Exhausts
Design911 supplies SSI exhaust parts for classic air-cooled Porsche models, including stainless-steel heat exchangers, headers and compatible system components. Originating as a traditional Californian brand and manufactured by JP Group Automotive in Denmark since 2013, SSI is particularly associated with Porsche 911 F-model, 911 G-model and 914 applications produced between 1964 and 1990. Our Porsche specialists can help you identify the correct configuration for your engine, heating arrangement and intended exhaust system.
Why do Porsche SSI exhausts matter?
SSI is well known in the classic Porsche world for heat exchangers and headers designed to improve exhaust flow while retaining cabin-heating provision where specified. Owners commonly choose these parts when rebuilding or upgrading an air-cooled engine, seeking improved response, a more distinctive exhaust tone and quality stainless-steel construction. The potential result depends on the engine, existing exhaust and complete system specification, so model and year compatibility must always be checked.
- Replace leaking, corroded or damaged exhaust and heat exchanger components
- Provide a carefully matched exhaust route for selected classic air-cooled Porsche engines
- Retain cabin-heating functions when the correct heat exchanger arrangement is fitted
- Offer corrosion-resistant stainless-steel construction
- Support restoration, maintenance and carefully planned exhaust upgrades
Common SSI exhaust options
Heat exchangers and headers These components route exhaust gases away from the cylinder heads and can also supply warm air to the cabin. SSI versions are available for specific Porsche 911 and 914 applications, with pipe diameter, flange arrangement and heater connections varying by engine.
- Check the exact Porsche model, engine and production year
- Confirm heater-hose and cabin-heating compatibility
- Select the correct tube diameter for the engine specification
Matched left and right sets Heat exchangers are often renewed as a matched pair to maintain a consistent configuration across both sides of the engine. Sets may be appropriate during restoration or when corrosion and heat cycling have affected the existing system.
- Provides compatible components for both sides
- Useful when completing a wider exhaust overhaul
- Allows associated studs, gaskets and fixings to be renewed together
Conversion and complete exhaust systems Some classic Porsche applications can use SSI components as part of a free-flow conversion or upgraded exhaust arrangement. These installations may require a compatible dual-inlet silencer, redirected oil lines, clearance checks or changes to engine tinware.
- Must be matched to the engine and existing exhaust layout
- Silencer inlet configuration must be checked
- Oil-line routing, oxygen-sensor provision and engine-tin clearance may need attention
Brands available in this category
SSI products sit within the quality aftermarket tier, providing standard replacement and performance-oriented options for selected classic Porsche applications. Genuine Porsche is the factory parts tier, while OE Match components are manufactured to original-equipment specification. The right choice depends on the car, budget and purpose, whether routine maintenance, restoration or a carefully planned upgrade.
SSI SSI is a traditional Californian marque manufactured by JP Group Automotive in Denmark since 2013. Its range is particularly known for stainless-steel heat exchangers and exhaust components for classic Porsche 911 F-model, 911 G-model and 914 applications. TÜV and KBA approval documentation is available for applicable parts within the wider range.
When should you review or replace your Porsche SSI exhaust?
Inspect the exhaust and heat exchangers when rebuilding or upgrading an air-cooled engine, when cabin heating becomes ineffective, or when age and repeated heat cycles begin to affect the system. An SSI installation should be selected around the precise engine, model year, heater layout and compatible silencer rather than on appearance alone.
- Exhaust leaks or ticking noises are present
- Soot marks appear around flanges or joints
- Older components show corrosion or perforation
- Welds have cracked after repeated heating and cooling cycles
- Exhaust studs or fixings are broken, seized or badly corroded
- Cabin heating is poor because heat exchanger components have deteriorated
- You are rebuilding an air-cooled engine and want to review exhaust flow and response
- You are planning a conversion and need to confirm silencer compatibility, oil-line clearance and new fixings
If these symptoms are present, inspect the full system before ordering. Correct installation may require new gaskets, fasteners and studs, as well as checks around the silencer, oil lines, heater connections and engine tinware.
Explore Porsche SSI exhausts with Design911
Browse SSI exhaust components for classic Porsche models at Design911. Our range supports targeted repairs, restoration work and complete system projects, with worldwide delivery and advice from people who know these cars.
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Sport Silencers / Mufflers
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Switchable Silencers / Mufflers
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1 IN / 1 OUT
Standard Silencers -
1 IN / 1 OUT
Sports Silencers -
1 IN / 2 OUT
Sports Silencers -
2 IN / 1 OUT
Standard Silencers -
2 IN / 1 OUT
Sport Silencers -
2 IN / 2 OUT
Standard Silencers -
2 IN / 2 OUT
Sport Silencers -
All Silencers / Mufflers
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Catalyst / Bypass
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Manifold / Headers
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Exhaust Tail Pipes
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Heat Exchangers
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Exhaust Pre-Silencer
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Exhaust Cross over pipes
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Exhaust Package
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Exhaust Gaskets
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Exhaust Nuts / Bolts / Studs
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Brackets / Clamps / Straps
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Exhaust Fitting Kits
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Sport Exhaust Vacuum Parts
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Lambda Sensors / Probes
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Lambda Sensor Extensions
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Dansk Exhaust
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Fabspeed Exhaust
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