Increase the performance and reliability of your BMW 335d by eliminating the restrictive Diesel Particulate Filter (DPF) system, thus allowing the exhaust to flow more freely. This DPF Delete downpipe is built to last with 304 grade stainless steel and the world's most reliable aftermarket flex pipe. Rawtek has engineered this downpipe to be as good as it can be. From the laser cut turbo flange to the large 3.5" OD constant diameter tubing that ends in a concentric reducer to bring it down to 3" OD, nothing will outflow this downpipe. For bulletproof reliability in even the most severe environments and to help reduce under hood temperatures and noise, we build these downpipes twice as thick as anything else on the market. Yet another reason we can offer a lifetime warranty that we’re confident you’ll never have to use.