The G-Face RX7 exhaust system is composed of stainless steel. The main pipe is 90mm, designed to improve the exhaust flow for better enhanced performance. The tailpipe features a 90mm exit. This exhaust system is designed with 2 inner silencers, to enjoy the three kinds of sounds according to your mood. The exit part of the exhaust (rear silencer) has been raised as much as possible to become less susceptible to car stops. Both early and late model products are conforming to safety standards.