Vance & Hines Backslash 450 Slip On Mufflers For Harley Touring The Backslash 450 from Vance & Hines is the perfect addition of sound and performance you need with a stealthy vibe. These 4.5 slip-ons are designed to match the cut of the extended bags on Harley Touring Motorcycles. These will provide a rich sound from the patent pending Ls-275 baffle design. Features Designed specifically to complement the M8 motor Spin-formed 4.5 round muffler bodies Ls275 baffles provide a deep intimidating rumble 50 State emission compliant Includes mounting hardware