If you are looking to step up the sound, performance, and look of your BMW 135 turbo, then adding the Agency Power axle back muffler exhaust is the answer. The full stainless steel muffler features TIG welding, a polished finished, and dual titanium tips to let everyone you mean business. The axle back muffler fits to the stock midpipe to not only save weight, but improve performance. The muffler deletes the depressingly quiet and heavy factory flapper valve design stock muffler to give you a more aggressive tone all the time. Without droning in the cabin, the AP muffler enhances the sporty BMW sensation under acceleration. Turn up the volume and increase exhaust flow with this quality piece.