Stainless Systems Inc. has for years set the standard for Porsche stainless exhaust heat exchangers. They are manufactured out of 100% stainless steel so they won't rust, and will last longer than you car!
Replacing the exhaust system with SSi’s on 1975 and later cars is often good for about 15 more horsepower. The SSI heat exchangers are based on the 1974 and earlier 911 exhaust design that was highly optimized for the Porsche 911 engine. 1975 brought about changes in the exhaust that severely limited the flow capacities of the engine, in order to make the engines pass stricter smog standards. The SSI 1974-style heat exchangers are a bolt-on replacement for all thermal reactor cars (1975-77). Using the SSI heat exchangers will make these engines run cooler, make 16 more horsepower (10%), and 28 ft-lb more torque at 3,000 RPM (26% improvement). In addition, the reduced heat from the SSIs will help the engines last much longer. 911SC engines can expect to see an addition of 30 ft-lb of additional torque at 3,000 RPM (increase of 24%).
The most important decision a manufacturer of heat exchangers can make is what materials to use in the tube work and the ducting. The ducting must fail first, otherwise carbon monoxide has the potential to leak from the tubes inside the ductwork resulting in a dangerous situation. To this end, SSI uses only time-tested stainless steel #304 (18% Cr, 8%+ NI) for both tubes and ducting.
SSi products available from CoolCava Racing
