Dynomax 17289 Ultra Flo Stainless Steel Muffler Stainless steel construction for lifelong protection Polished finish for a show quality shine Dyno proven to flow up to 2,000 SCFM and support up to 1,900 horsepower Straight through design ensures unrestricted exhaust flow and reduces back pressure CRF Technology absorbs unwanted interior resonance while maintaining a deep performance tone