Get unmatched performance without the complexities of a full exhaust system. The 2-into-1 Torque Booster Conversion Kit transforms your 2017 stock header into a torque and power producing 2-into-1 system. The kit includes a 4.50" HP-Plus Slip-On Muffler and a performance engineered 2-into-1 Converter Cap. Combined, your bike will see performance gains up to 14%. This revolutionary kit makes it possible to ride like a rebel without paying the price. 4.50" 16-guage muffler body New absorptive baffle covered with stainless steel mat and high temperature fiberglass developed just for the Milwaukee-Eight Improved torque and horsepower from the hit of the throttle Bolt in optional insert available that complies with SAE J2825 sound test with no appreciable loss of performance