Downpipe Kit with HJS-ECE-300CPSI Racing catalyst for BMW M140(x)i 340i 440i & 540i made out of high quality stainless steel 1.4301 (SS304) complete Ø3,5 and adapter for stock exhaust HJS (ECE approval) 300CPSI EU6 Racing Metal Catalytic Converter 100% perfect fit, replace OEM less thermal load on the turbocharger more power by reducing back pressure significantly more torque Only suitable for cars without GPF!