Downpipe Kit without catalyst converter for BMW M140(x)i M240i 340i 440i & 540i made out of high quality stainless steel 1.4301 (SS304) complete Ø3,5 and adapter for stock exhaust without catalyst 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! Error display in the DME, because removed catalyst converter.