Description Reviews As more performance parts come out for the N14 and N18, one of the things you need is a catless downpipe to run the boost you want with a tune. Milltek has been in the game for a long time and has come out with version 2 of their downpipe. The turbo mating surface is now cast and machined to a high tolerance for perfect fitment. The rest of the downpipe is robotically welded to ensure quality on every weld. The pipe is stainless steel and mandrel bent to maintain the large 2.5 DIA bore of the pipe. Milltek says you will get a 27bhp gain, but that can go up with a good tune. Great flow, good fitment, and a low price! All winning features in this downpipe. We also have a version with a cat for states that require it. You may get a check engine light unless the car has a tune. Note: Not legal for on road use or use in California. For off road use only. Specs: Stainless Steel Mandrel Bent Robotically Welded Pipe DIA of 2.50" (63.50mm) 3 Reviews 5 Super awesome pops, noticeable horsepower gainn Posted by Cole Ferguson on 21st Jun 2021 Pretty easy to put in. Fit perfectly awesome rumbling pops in sport mode. It will throw an O2 sensor code so definitely get tuned. 4 Good fit. Posted by Chris on 20th Jul 2020 This downpipe fit directly into my 2011 r55. Shipping was incredibly quick. All around good service, I will be shopping here again. 5 Milltek de-catted dwnpipeo Posted by Dale on 4th Jun 2020 Great product. Awesome service. I bought it in the late afternoon and they had a shipping confirmation 45 mins later!!!! It was packaged well and arrived in perfect shape. What more could you ask for????