We developed the PowerCore4 to increase the horsepower and torque throughout the entire power curve producing a noticeable power increase that is useable and compatible with every style of riding. Aluminum construction and stainless steel Hi-Flo endcaps make for the perfect balance of performance and strength. • Aluminum performance muffler with durable stainless steel components • Completely redesigned for all late model applications • Removable spark arrestor included