Borla XR-1 Racing Sportsman 4in Inlet/Outlet Center/Center Oval Muffler-4.5in Diameter x 12in LengthHigh 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

Computerized

Suitable for use with gasoline fuels only

Compared to standard aftermarket IWIS LS timing chains

Best of all it comes with the BORLA® Million Mile Warranty

Oval Straight-Through Performance Exhaust Muffler 12158 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno-proven performance thanks to its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill

Avoid any device that reduces voltage to your fuel pump

Includes both upper and lower mounts

Injector Dynamics +14mm Bottom Adapter 14mm Lower O-Ring - Black

000 HP naturally aspirated and up to 800 HP forced air induction

Stainless steel terminals utilizing up to 3 serrated crimps bite into cable jacket and inner insulation for the highest terminal retention strength (wherever possible)

5mm Spark Plug Wire Set for LS Chevy Standard with High Temp 135° Boots

in order to maintain the original front to rear brake bias and use of the OE master cylinder