Downpipe ø 70mm stainless steel for BMW S55B30 F82 F82 M3 M4 with 200 cell sports catalytic converter/metal catalytic converter and flex pipe

By reducing the backpressure with the ø 70mm downpipe with 200 cell sports/metal cat, the turbocharger is relieved, resulting in increased performance and lower exhaust temperature. The post-cat sensor may need to be reprogrammed. The manifold is made of stainless steel. The flange surfaces are machined. There are 4 lambda probe connections M18x1.5mm welded, 2 pre-cat and 2 post-cat respectively.