Borla XR-1 Sportsman Racing Muffler 4in In/4in Out Muffler 2018-chevrolet-silverado-3500-hd-wt-esi3203721 25" diameter into the mufflers

25" diameter into the mufflers

Notched necks for easy clamp-on installation using 1" wide band style clamps 18302 (clamps not included)

Called ATAK(r) (Acoustically-Tuned Applied Kinetics)

For Convertible use 11938

Designed for high horsepower applications in low profile vehicles with limited space including vehicles with rotary engines

Borla XR-1 Sportsman Racing Muffler 4in In/4in Out Muffler 2018-chevrolet-silverado-3500-hd-wt-esi3203721 25" diameter into the mufflersHigh 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 applications because it is the lightest, most compact, and