Borla XR-1 Sportsman Racing Muffler 4in In/4in Out Muffler turn14-product-not-found-review We wanted to develop a

We wanted to develop a manifold with an improved design to allow more flow

Our first prototypes of this system were indeed 3

Patented design provides most adjustment on the market

Cost effective solution of engine retarding for towing with the Ford PowerStroke by utilizing the OEM Exhaust Back Pressure (EBP) valve

Available in Polished (SP1572P) and Black (SP1572BLK)

Borla XR-1 Sportsman Racing Muffler 4in In/4in Out Muffler turn14-product-not-found-review We wanted to develop aManufacturer Part # : 40948 Market Description High quality austenitic stainless steel. Patented, race winning XR 1 Raceline technology. 3 options: Offset Made with the same patented, flow through design as the XR 1 Sportsman oval. The inlet outlet are offset to the same side of the muffler, to accommodate transmission and frame rail interference on some applications Oval BORLAs #1 selling racing muffler. Satisfies the needs of most racing