Stainless Steel downpipe fits BMW F20 135, 235, 335, 435, 535 variants 3.0T engines. Includes stainless steel heat barrier pre-welded to the downpipe. Includes flanges and mounting hardware for a 100% bolt on fit requiring no modifications at all. Although the downpipe is manufactured to look like there is a Catalytic converter build in, it is supplied catless.