Khrome Werks 4-1/2" HP-Plus® Slip-On Mufflers With Race Tip - Chrome - M8555547102 Product Description 4 1 2" 16 gauge muffler body These mufflers have been dyno tested and show a 12% increase in torque and 7% increase in power Absorptive baffle wrapped with stainless steel mat and high temp fiberglass Engineered for performance, style, and sound Produce the Khrome Werks signature authoritative tone without annoying high frequency noises Improved torque and horsepower from the hit of the throttle Billet aluminum tips can