From the engine, the exhaust flows through our 1- ¾” 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.