The WAGNERTUNING Downpipe Kit for BMW N54 engines fits to: BMW 135i E82/E88 BMW 1er M E82 BMW 335(x)i E90/E91/E92/E93 BMW 335is E92 2009-2013 true 70mm Downpipes made from 1.4301 (SS304) Stainless Steel no catalytic converters* 1:1 exchange to OEM Units CAD designed for track and test with flex part *ECU will need to be coded to avoid engine management light errors.