KHROME WERKS 1801-1827 201940 4-1/2" HP-Plus® Slip-On Mufflers with Race Tip - Eclipse® - M8Features 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 Produce the Khrome Werks signature authoritative tone without annoying high frequency noises Improved torque and horsepower from the hit of the throttle Engineered for performance, style, and sound Billet aluminum tips can be rotated 360 at 90