Invidia's most popular exhaust system. Specifically designed to bridge the sound gap between the Q300 system and the N1 system, the R400 produces a unique aggressive note while minimizing cabin noise (especially at highway speeds). The R400 muffler was designed using years of Invidia engineering experience to achieve the perfect balance between unrestricted exhaust gas flow and sound deadening. This exhaust system will provide a pronounced exhaust note throughout the rev band, even when installed as a cat-back system only. The design of the R400 muffler also looks great with a race-inspired design that will turn heads. The Invidia R400 Exhaust takes quality, performance and looks to a new level. From start to finish, Invidia exhaust systems are designed with performance in mind with the exhaust route carefully selected to ensure minimal bends, allowing unobstructed exit of exhaust gases with minimal restrictions and of turbulence. This will improve both horsepower and torque, as well as improve throttle response with reduced turbo lag for turbocharged vehicles. Plus, you get the reward of an aggressive exhaust note.