The OEM factory exhaust can be replaced with Vance & Hines 2-into-1 competition brushed stainless-steel slip-ons (with 4 springs to hold on magaphone -- looking much like the Destroyer exhaust). They come with O2 bungs for both diameter O2 sensors. Forget the fiberglass packing in the baffeling and replace this with stainless-steel (six 3M pot scrubbers opened to a donut and pulled around the baffle) for a quieter tone that has a deeper