HARLEY LAF BLACK 304 EXHAUST Made out of T304 stainless steel then high temperature coated matte black. 18MM o2 Bungs are welded on each exhaust pipes and it also comes with plugs for the o2 bungs if your bike doesn't have o2 sensors. Supplied bracket to mount the 2 pipes together. These were not intended for the Dyna, Touring Models, or Buell Lightning X1. You may need to make minor adjustments or modifications.