Performance Motorsport Parts decat pipes are designed to replace the stock catalytic converter with a less restrictive part, allowing better gas 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 N20 engines ---Designed to improve power and torque across the entire RPM range ---Sold for off road and track use only Compatible with: BMW 1 Series F20 F21 N20 2012-2018 models BMW 2 Series F22 F23 N20 2014-2018 models BMW 3 Series F30 F31 F35 N20 2011-2019 models BMW 4 Series F32 F33 F36 N20 2013-2020 models.