Designed specifically to address the needs of tuned motors built for high horsepower applications. Use a unique extended inner collector maximizing performance. Feature equal-length stepped headpipes; stepped three times (1-3/4″ to 1-7/8″ to 2″) and are for 125+ horsepower applications. 4″ straight-style performance muffler body with 2-1/2″ x 16-1/2″ baffle and black billet end cap with contrasting machined flutes. Include full-coverage heat shields. Oxygen sensor port plugs also included for non-sensor applications. Made in the U.S.A..