Khrome Werks 2-Into-1 Outlaw Exhaust System - Black - No End Cap Included636632405 Product Description Designed to increase horsepower and torque while providing an aggressive, low frequency sound level 1 3 4 to 1 7 8 to 2 high flow 16 gauge stepped primary headers with a 2 1 2 collector 4 1 2 diameter, 16 gauge HP Plus muffler with 2 1 2 inlet Removable 1 1 2 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 1 2,