S&S Cycle High Performance Tapered Mufflers 55-6040 Low restriction, high performance Cost-effective performance upgrade best horsepower/dollar ratio Maintains a smooth power curve while delivering excellent low and midrange torque makes adjustments to the fuel delivery system minimal and straightforward Show chrome finish NOTE: It may be necessary to rejet the carburetor or recalibrate the fuel injection system for best performance when a change is made in the exhaust system.