Stepped headpipes 1-3/4″ into 1-7/8″ designed for maximum horsepower & torque. Utilizes an advanced inner collector for maximum performance. Upswept Super Bike 4″ stainless muffler body with aluminum end cap and a new removable conical performance baffle delivers an all new aggressive exhaust sound. Stainless steel construction with a stainless steel finish. Hand TIG welded. Includes 18mm O2 bungs for tuning, 12mm adapters and plugs. Full coverage stainless heat shields for the front and rear pipes included. Removable baffle. Made in the U.S.A..