Cobb Tuning 10-13 MAZDASPEED3 Gen2 SS 3" Cat-Back Exhaust - 572101EMISSIONS This part is not an emissions related part and therefore can be used on Emission Controlled Vehicles. DESCRIPTION The layout of this COBB 3" SS Cat back was chosen to minimize the total bend degrees used to route the exhaust piping for reduced back pressure. The entire system fits within the factory exhaust path to allow the exhaust to be tucked up as close to the undercarriage as possible to achieve maximum ground clearance. Exhaust piping