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XR-1® Raceline
Featuring a patented uninterrupted-flow internal design and our Multicore technology, our XR-1® mufflers outflow a straight piece of pipe in repeated testing. For racing applications only!
Four important reasons racers win with Borla
- You fear what you can't hear. Especially in any kind of breakout drag racing where you can "sneak up" on an opponent
- Improved driver awareness. Drivers in all forms of racing can better tell what their cars are doing
- No loss in performance. Fact is, in some cases Borla's patented XR-1® mufflers actually improved horsepower over a straight piece of pipe
- Reduced driver fatigue. Very important in many forms of competition
Features
- T-304 stainless steel will never rust our thickest material
- 100% welded construction is track-tough
- Free-flow design for improved performance
- XR-1's race-proven design attenuates sound without restricting flow
- Hi-temp Continuous Filament Fiber (CRF) or T-304 Stainless Steel wool (depending on app) for sound control
- Sportsman mufflers feature hi-temp Continuous Filament Fiber (CFF) acoustic material for sound control
- Natural mill finish can be brushed or polished prior to installation
- Reversible design for installation flexibility
- Recommended for high-horsepower racing applications
XR-1® Raceline(4) 
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XR-1 Raceline
Part# 401392 What vehicle does this fit?

Pipe Diameter:2.5"
Has Valves FALSE
- Universal muffler. Reversible design.
- 2.5" Center Inlet/ 2.5" Center Outlet 5" Round x 15" Long Body, 20" Overall Length.
- Compact size is perfect for applications with limited space
- Un-Notched necks are designed for weld in installation
Price: $148.99
XR-1 Raceline
Part# 40086 What vehicle does this fit?

Has Valves FALSE
- Universal muffler. Reversible design.
- 3.5" Center Inlet/ 3.5" Center Outlet 5" Round x 15" Long Body 20" Overall Length
- Compact size is perfect for weld in installation
- Un-Notched necks are designed for weld in installation
Price: $167.99
XR-1 Raceline
Part# 40085 What vehicle does this fit?

Has Valves FALSE
- Universal muffler. Reversible design.
- 3" Center Inlet/ 3" Center Outlet 5" Round x 15" Long Body 20" Overall Length
- Compact size is perfect for applications with limited space
- Un-Notched necks are designed for weld in installation
Price: $146.99
XR-1 Raceline
Part# 40004S What vehicle does this fit?

Has Valves FALSE
- Universal muffler. Reversible design.
- 3.5" Center Inlet/ 3.5" Center Outlet 5" Round x 8" Long Body 13" Overall Length
- Compact size is perfect for applications with limited space
- There is no logo embossment on this part
- Un-Notched necks are designed for weld in installation
Price: $178.99
