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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(2) 
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XR-1 Raceline
Part# 40741 What vehicle does this fit?

Has Valves FALSE
- Universal muffler. Reversible design.
- Long body design works well on SUV & truck applications
- Can be used on a wide range of vehicles including rotary engine equipped vehicles
- 4" Center Inlet/ 4" Center Outlet 6.25" Round x 16" Long Body 21" Overall Length
- Multi-Core 6 tube internal design. High tempertaure T-304 stainless steel wool for sound control.
Price: $409.99
XR-1 Raceline
Part# 400374 What vehicle does this fit?

Has Valves FALSE
- Universal muffler. Reversible design. No BORLA® logo embossement.
- Long body design works well on SUV & truck applications
- Can be used on a wide range of vehicles
- 4" Center Inlet/ 4" Center Outlet 6.25" Round x 16" Long Body 21" Overall Length
- Multi-Core 4 tube internal design
Price: $390.99
