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 ---Free flowing catalyst replacement to get the most from the B58 engine ---Designed to improve power and torque across the entire RPM range ---Sold for off road and track use only Fitment: BMW 1 Series M140i B58 2015+ models BMW 2 Series M240i B58 2015+ models BMW 3 Series 340i B58 2015+ models BMW 4 Series 440i B58 2015+ models BMW 5 Series 540i B58 2015+ models BMW 6 Series 640i B58 2015+ models BMW 7 Series 740Li B58 2015+ models.