The Vance & Hines 4 1/2" Backslash 450 Slip-Ons Mufflers delivers the best sound, best performance, and best style for your Harley-Davidson Milwaukee Eight motorcycle. For the rider looking to enhance the long and low profile of stretched saddlebags the Backslash 450 Slip-ons puts on the finishing touch with the deep rumble of the LS275 baffle and large 4.5″ mufflers that fill out the exhaust cutouts and sit flush with rear angle of the bags.