Borla XR-1 Raceline Sportsman Muffler 4" Center Inlet / 4" Center Outlet (40947)
Unleash uncompromised track performance and maximize horsepower with the Borla XR-1 Raceline Sportsman Muffler. Specifically engineered for extreme high-horsepower racing applications, heavy-duty diesel or gas trucks, and demanding engine setups where chassis space is limited, this compact oval racing muffler utilizes a massive, high-flow 4-inch straight-through performance internal architecture. By completely eliminating restrictive backpressure, it drastically improves exhaust gas velocity to maximize horsepower and torque delivery, making it an exceptional choice for competitive track environments. The Sportsman series is widely recognized for offering the ultimate competitive balance of flow volume and raw power delivery.
Built to endure the intense heat and harsh environments of competitive motorsport, this heavy-duty race muffler features a 100% welded chassis manufactured from premium T-304 austenitic stainless steel for superior protection against rust and corrosion. Its compact 12-inch body delivers excellent underbody packaging flexibility for custom fabrication layouts in tight spaces. Sound attenuation is managed by premium, high-temperature continuous-filament fiber (CFF) acoustic packing material, which dampens high-frequency harshness while preserving an aggressive, wide-open racing roar under acceleration. Delivering ultimate installation flexibility with a fully reversible inline layout and smooth, un-notched necks, this American-made unit arrives ready for a clean weld-in installation.
Features
- Straight-through free-flow design reduces backpressure to unlock horsepower and torque
- Sportsman racing architecture delivers an optimal balance of structural flow and sound power
- Manufactured from 100% welded, premium T-304 austenitic stainless steel for maximum durability
- Compact 12" long body provides exceptional packaging flexibility in tight underbody spaces
- Packed with heavy-duty continuous-filament fiber (CFF) to survive extreme racing temperatures
- Smooth, un-notched necks optimized for direct weld-in custom exhaust fabrication
- Fully reversible, universal design features a straight-line 4" center inlet and 4" center outlet
- Proudly made in the USA to deliver elite performance on a wide range of track vehicles
Fitment
- Universal Fitment
- High-Horsepower Race, Street/Strip, Truck, and Custom Performance Vehicles
- Universal 4" Weld-In Center-Inlet/Center-Outlet Track Applications
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
