This fits all BMW models that end in a 40i which have the B58 engine:
240i/340i/440i/540i/640i/740i/840i/X3M40i/X4M40i/X540i/X640i/X740i/Z4M40i
A cat-less downpipe is the most effective way to boost power and get the sound you want. The defining feature of our downpipes is the welded Stainless Steel 304 heatshield that completely encases the piping. This contains the heat from the 1200F exhaust gas within the exhaust system. OEM and competitor's downpipes without heat shielding cause heat soak of components under the engine bay. Run safer, harder, and longer on the track with Stay Tuned Race Downpipes.
OFF ROAD/MOTORSPORT USE ONLY!
*This product is not designed to meet any emissions/noise standards and is not for street or highway use. This product is not certified and may not be legal for use on emissions controlled vehicles in any country/jurisdiction.