Two Brothers Racing Harley Davidson Touring (2017-20 Milwaukee Eight) Comp-S 2-1 Black Aluminum End Cap / Black Exhaust Designed to deliver maximum torque. Race-inspired stainless steel headers shave pounds off the competition to ensure a long lasting, weather-resistant, amazing sounding exhaust. Comes complete w/ heat shields. From the engine, the exhaust flows through our 1 and stainless tubing which includes O2 bungs to accommodate both stock and 18mm sensors. From here the exhaust steps up to 1 and 7/8 before dumping into the spring retained collector for increased torque. The exhaust then emerges from the collector into our 4 Touring muffler to deliver an unparalleled sound upon exit.