Designed specifically to address the needs of tuned motors built for high horsepower applicationsUse a unique extended inner collector maximizing performanceFeature equal-length stepped headpipes stepped three times (1-3/4'' to 1-7/8'' to 2'') and are for 125+ horsepower applications4'' straight-style performance muffler body with 2-1/2'' x 16-1/2'' baffle and black billet end cap with contrasting machined flutesInclude full-coverage heat shieldsOxygen sensor port plugs also included for non-sensor applicationsMade in the U.S.A.