A high quality, high flow, TIG welded pair of downpipe sections with decat for the BMW M3 F80/M4 F82 series. Hand-crafted from T304 stainless steel, this part is a direct fit replacement that is ideally installed before an ECU remap in order to maximise the vehicle’s power gains. An absolutely essential upgrade in order to get the most power from your M3 F80. The part is direct fit, T304 stainless steel and lifetime guaranteed. Sensor bung holes have been pre-installed for use with lambda sensors or a lambda cheat/mini cat.