Cobb Tuning Mitsubishi EVOX Oval Tip Cat-Back Exhaust - 552111EMISSIONS This part is not an emissions related part and therefore can be used on Emission Controlled Vehicles. DESCRIPTION Designed as a direct replacement for the factory cat back exhaust, the new COBB Cat Back exhaust system for the Mitsubishi EVO X has been completely redesigned to improve the look, sound and performance of this system. Tubing diameter was increased to 3" and bends were kept to a minimum with large radii for optimum flow