SSi Exhausts

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.