Black 2:1 exhaust header set features lake style 3" big diameter turn out ends that are baffled, full coverage black removable heat shields and 1-3/4" header tubes. Includes both 12mm and 18mm O2 sensor bungs and sensor bung plugs for both bungs. Turn out end is clamped on and will allow the installer to rotate into the desired position. *NOTE: Maximize your motorcycles performance and efficiency by complementing your new Wyatt Gatling exhuast system with a fuel turner management system and or EFI remapping. Remapping is suggested to optimize performance while reducing the possibility of damage to your motor or new exhaust system. *NOTE: The footboard spacer with lock pin may be required.