Designed to increase horsepower and torque while providing an aggressive, low-frequency sound level. 1.75” to 1.875” to 2” high-flow 16-gauge stepped primary headers with a 2.5” collector. 4.5” diameter, 16-gauge HP-Plus muffler with 2.5” inlet. Removable 1.5” absorptive baffle with 3” reverse cone outlet to maximize torque; baffle is wrapped in stainless steel wool and high-temp fiberglass for a rich, mellow tone. 2.50”, 220°, 16-gauge heat shields. 18 mm and 12 mm O2 bungs welded into the primaries. Optional Ghost pipe available separately to give a 2-into-2 look. Made in the U.S.A..