DynoMax Ultra Flo Welded performance stainless steel mufflers feature 100-percent welded construction for lifelong durability. The unrestricted, straight-through design dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower. Each muffler Product Features:Stainless steel construction for lifelong protection100% welded design for maximum durabilityStraight through design ensures unrestricted exhaust flow and reduces back pressureCRF Technology absorbs unwanted interior resonance while maintaining a deep performance toneDyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower.