Heat Exchangers


- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
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Related, superseded, cross reference or alternative numbers for comparison.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
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

Fits:
Porsche 911 3.2L Conversion SSI STYLE
*Oil pipes 91110772910 and 91110773910 are also required also see our exhaust packages
Special performance: Can replace 91133091104S heaters, but stock exhaust must be changed to two inlet pipe system Polished Stainless steel.
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.
Related reference numbers
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9113309101
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- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
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.
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91121101
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)

Fits:
Porsche 911 Carrera 3.2L 08/1983-07/1989
Porsche 911 Turbo (930 Turbo) 3.3L 08/1983-07/1989
Kit included:
1x Large gasket for mounting heat exchanger to intermediate tube
3x Gasket for heat exchanger to cylinder head. 3 pcs. required for each heat exchanger
3x Bolt, M8x1.25x40mm
3x Nut M8x1.25, for mounting heat exchanger to cylinder head
3x Lock nut, M8x1.25, cu. Plated
3x Nut, M8x1.25



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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Sold each - 2 required per car.
Fits:
Porsche 911 3.2 Carrera - 1984 to 1989
Diagram ref no 22
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93021133904
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Sold Each, x2 Required Per Car.
Fits:
Porsche 911 3.2L Carrera 1984>>1989
Diagram Ref No 22
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93021133904
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
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.
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1620802710
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Fits:
Porsche 911 3.2 Carrera - 1984 to 1989
Sports Exhaust package with two Ø84 mm tail pipes, heat exchangers and oil pipe set for the 911 3.2 Carrera.
OEM style with no modifications of engine tinware needed for installation.
Made of polished stainless steel
Material: Polished Stainless SteelNumber of Inlets / Outlets: 2/2
Surface: Blank
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1620803010
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

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.
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1620802610
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

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
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1620802310
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

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
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- 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 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Fits:
Porsche 911 Chassis 1965-89 Fitted With M64 964/993 3.6L Engine
LONG LIFE
Made from AISI 321/EN4531 titanium-stabilised stainless steel, these heat exchangers are built for durability, with an expected lifespan of 20-30 years in high-salt environments and even longer in milder conditions.
HIGHER POWER OUTPUTDesigned to optimise exhaust flow, these headers improve power output, particularly in low and mid-RPM ranges, by reducing intake charge disturbances at valve overlap and enhancing exhaust gas extraction. SSI headers are a refined version of Porsche’s competition-proven six-cylinder header design.
CARBON MONOXIDE SAFE
Unlike other aftermarket options, SSI heat exchangers are engineered to prevent internal corrosion from engine acids, reducing the risk of carbon monoxide leaks. Constructed from high-quality AISI 304 stainless steel with seamless primary tubes, they eliminate weak weld points that could lead to cracks and leaks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91133091936SSI
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- 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 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93

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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Title: Upgrading Your Porsche with Exhaust Heat Exchangers: Technical Specifications and Benefits
Improved Performance: Upgrading your Porsche's exhaust heat exchangers, whether with an original Porsche or after-market option, can significantly enhance your vehicle's performance. The improved design and materials used in these heat exchangers help to optimize exhaust flow, resulting in increased horsepower and torque.
Efficient Heat Dissipation: Exhaust heat exchangers play a crucial role in dissipating the excess heat generated by your Porsche's engine. Upgrading to high-quality heat exchangers ensures efficient heat dissipation, preventing overheating issues and prolonging the life of your engine.
Enhanced Durability: Original Porsche or after-market exhaust heat exchangers are built using durable materials, such as stainless steel or high-grade alloys. These robust components offer superior resistance to corrosion, heat, and vibrations, ensuring long-lasting performance and reliability.
Emissions Compliance: Upgrading your Porsche's exhaust heat exchangers can help your vehicle comply with emissions regulations. Many aftermarket options are designed to meet or exceed emission standards while maintaining optimum performance levels.
Precise Fitment: When purchasing exhaust heat exchangers for your Porsche, it is crucial to ensure they are specifically designed to fit your vehicle model and engine type. This ensures a seamless installation process and optimal functionality.
At Design911, we specialize in providing high-quality Porsche parts, including original Porsche and after-market exhaust heat exchangers. Our extensive inventory and knowledgeable staff allow us to help you find the correct part for your Porsche model. We offer professional advice, ensuring you make an informed decision based on your specific requirements. Trust us to provide the best solutions to upgrade or replace your Porsche's exhaust heat exchangers, improving performance, durability, and overall driving experience. Contact us today to explore our range of Porsche parts and benefit from our expertise.