Designed to increase horsepower and torque while providing an aggressive, low-frequency sound level 1.75ö to 1.875ö to 2ö high-flow 16-gauge stepped primary headers with a 2.5ö collector 4.5ö diameter, 16-gauge HP-Plus muffler with 2.5ö inlet Removable 1.5ö absorptive baffle with 3ö reverse cone outlet to maximize torque; baffle is wrapped in stainless steel wool and high-temp fiberglass for a rich, mellow tone 2.50ö, 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.. EXHAUST 2:1 M8 FL CHRM