Khrome Werks KW202350 3" HP-Plus Slash Cut Slip-On Mufflers Chrome for Softail FXST 07-17/Heritage Softail Classic 07-17/Breakout 13-17/Rocker 08-11Description for Khrome Werks 3 in. HP Plus Slip On Slash Cut Mufflers 202350 Patented steel construction baffle now features more high temperature fiberglass packing, provides significant gains in horsepower and torque and exhibits a distinctive, throaty sound Use all factory mounting hardware Sold in pairs OEM heat shields may be retained U. S. patent 5,173,576 NOTES: ECM units on fuel injected models need to be recalibrated if used with free flowing