Performance Motorsport Parts Sports decats are designed to replace the stock catalytic converter removing all restriction, Our Performance decats allow better exhaust flow resulting in increased power and torque while also improving throttle responsiveness. ---Manufactured from highest quality T304 grade stainless steel, mandrel bent and fully TIG welded for strength and durability. ---CNC machined flanges for strong, solid support and an accurate fit, designed to improve power and torque across the entire RPM range. ---Noticeably improves the throttle response from the M57 engine. ---One of the most cost effective ways of releasing power from your diesel engine. ---Sold for off-road / track use only. Fitment: BMW 3 Series E46 330d / 330cd / 330xd M57 3.0L 1998-2005 models.