STAINLESS STEEL EXHAUST DECAT HEAT SHIELD FOR BMW 3 4 SERIES F30 F32 340I 440I. Our decats instantly increase power by allowing exhaust gasses to exit the vehicle quicker. Our decats are designed to be direct replacements for the OEM catalytic converter, ensuring smooth installation every time.Manufactured from high quality T304 grade stainless steel. Mandrel bent and fully TIG welded for strength and durability. Direct replacement for the stock part. Removes the restrictive catalytic converter to improve gas flow through the entire system.