Khrome Werks 4.50in. HP-Plus Slip-Ons - Black w/ Black Billet End Caps 202825Engineered for performance, style and sound Mufflers have been dyno tested and show increases in both torque and horsepower Produce the Khrome Werks signature, authoritative tone without annoying high frequency noises 4. 50in. 16 gauge muffler body Absorptive baffle covered with stainless steel mat and high temp fiberglass developed just for the M Eight Improved torque and horsepower from the hit of the throttle Mufflers sold in pairs Made in the USA