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Design911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk Facebook Instagram
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SSI

SSI

SSI
About SSI

SSI Exhaust Systems – Performance Headers for Classic Porsche Engines

SSI Exhausts is a highly respected performance exhaust manufacturer, best known for producing stainless steel exhaust headers for classic air-cooled Porsche models. Founded with a focus on motorsport-inspired engineering, SSI systems are designed to improve exhaust flow, throttle response, and engine efficiency while maintaining period-correct fitment and sound

Widely regarded as the benchmark upgrade for Porsche 911, 912 and early air-cooled flat-six engines, SSI exhausts combine precision fabrication with durable stainless steel construction. The result is improved mid-range torque, enhanced drivability, and a classic Porsche exhaust note that enthusiasts value.

At Design911, we supply genuine SSI exhaust components trusted by restorers, tuners, and classic Porsche specialists worldwide.

What Does SSI Exhausts Manufacture?

SSI specialises in performance stainless steel exhaust headers and heat exchangers for classic Porsche engines. Their product range focuses on:

  • Equal-length stainless steel exhaust headers
  • High-flow exhaust systems for air-cooled engines
  • Heat exchangers compatible with factory heating systems
  • Precision-welded components for exact Porsche fitment

SSI systems are engineered to optimise exhaust scavenging, improving power delivery without sacrificing reliability or originality.

Why Choose SSI Exhaust Systems?

SSI exhausts are a popular upgrade because they offer:

  • Improved exhaust flow and engine breathing
  • Noticeable gains in torque and throttle response
  • Durable stainless steel construction
  • Period-correct design for classic Porsche restorations

Unlike generic aftermarket exhausts, SSI systems are designed specifically around Porsche engine architecture, making them ideal for both performance builds and high-quality restorations.

When Should You Upgrade to an SSI Exhaust?

An SSI exhaust system is recommended when:

  • Replacing corroded or restrictive factory exhaust components
  • Restoring a classic Porsche to driver or fast-road specification
  • Improving engine performance without internal modifications
  • Seeking a refined, authentic air-cooled Porsche exhaust sound

Upgrading to SSI exhaust components delivers long-term durability and performance improvements while preserving the character of classic Porsche models.

At Design911, we stock carefully selected SSI exhaust systems to support dependable performance and authentic Porsche driving experiences.

Read more about SSI here.

DISPLAYING 33 to 33 (of 33 products)
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Heat exchanger sets, Stainless steel. Porsche 911 K-Jet Engine SSI - 91911SSI, 1623104910, 91911SSI
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Heat exchanger sets, Stainless steel. Porsche 911 K-Jet Engine SSI
91133091911SSI
Product Information
Product Information
Heat Exchanger Sets Stainless Steel Porsche 911 K-Jet Engine SSI

ssi

Replace the rusty, steel heat exchangers with these high quality stainless steel SSi units.
Made using AISI 321/EN4531 titanium stabilized stainless steel, these heat exchangers offer long life, increased power output and a quality fit.  

Price is for a SET OF 2

Fits:
K-jet (none mechanical injection engines)
911 (carb.) Europe 2.0L 01/63-07/73
911 (carb.) USA 2.0L-2.4L 08/65-07/71
911 (inj.) Europe 2.0L-2.4L 08/68-07/71
911 (inj.) USA 2.0L-2.4L 08/68-07/71
911 Europe 2.7L 08/73-07/75
911 Europe 3.0L 08/77-07/83
911 USA Federal 2.7L 08/74-07/75
911 USA Federal 3.0L 08/77-07/78


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.

91133091911SSI
91911SSI
1623104910
91911SSI

The product you are viewing cross references to these numbers
DISPLAYING 33 to 33 (of 33 products)
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