Our high flow performance exhaust systems maximize exhaust flow so your engine keeps its cool with lower exhaust temperatures. Your reward will be greater fuel efficiency; more torque; more horsepower; and last but not least a sound that is pure MBRP. Installer Series Turbo Back Exhaust System; 4 in.; Incl. Down Pipe/Mid Pipe/Extension Pipe/Muffler/Tailpipe/Hardware/5 in. Tip; Single Side Stock Cat Exit; Aluminized; 3.5" turbo down pipe, 5" OD tip included