Machined aluminum muffler brackets for increased strength and durability Asymmetrical muffler configuration for increased packing volume Most systems equipped with a RC-4 Resonance Chamber for reduced sound output Machined mid pipe to headpipe joint for a better, leak-free fit Removable U.S.F.S. approved spark arrestor TIG precision welding Made in the U.S.A.. EXHAUST T6 0122014F