BMW M135i F20/F21 - Back Box Muffler Delete Exhaust WITH SLASH CUTS 89MM!!
BMW M135i F20/F21 - Back Box Muffler Delete. This is a stainless steel performance rear section for the BMW M135i (N55) F20/F21! It is made from 2.5" Stainless Steel tube with 80mm slashcut tailtrims.