Invidia Catless Test Pipe Integra GSR (1994-1999) Wheels It is a proprietary muffler

It is a proprietary muffler design where it offers two different sound levels and characteristics depending on boost level and throttle input

Availabe for many popular turbos

In general

The system is constructed of SUS304 stainless steel and uses 1

The first accepts the hot charge air from the turbo and feeds it to the intercooler core

Invidia Catless Test Pipe Integra GSR (1994-1999) Wheels It is a proprietary mufflerRemoving restriction from your exhaust system is the key to added performance. Increasing piping size effectively does this, but with the stock catalytic converter in place you are still loosing horsepower. Invidia eliminated this with their catless test pipe. The test pipes are 60mm and are constructed of stainless steel. These pieces will finish off your exhaust system nicely and free up every last bit of power from your motor. Picture is for