Our performance 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 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 engine ---Designed to improve power and torque across the entire RPM range ---Sold for off road and track use only Fitment: BMW 5 Series F07/F10/F11 520i 528i 2011-2016 N20 Models Please Note: This decat is only suitable for models with the N20 engine.