Borla 4.25" x 7.88" x 16" Oval Un-Notched XR-1 Raceline Multi-Core Muffler, 3" Center/Center Universal Fit, 2014-2023 GMC Sierra 1500

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Frequently bought together:



  • Reversible Design for Installation Flexibility
  • Designed for Rotary Engine Equipped Vehicles
  • Recommended for High Horsepower
  • Compact Size is Perfect for Applications with Limited Space
  • Made From T-304 Austenitic Stainless Steel
  • 100% Welded Construction for Strength
  • Patented Multi-Core Design for Maximum Power
  • High-Temp Continuous-Filament Fiber Acoustic Material for Sound Control
  • Superior Balance of Sound and Power
  • Made in the USA
  • Million Mile Warranty


  • In/Out Diameter: 3"/3"
  • Overall Length: 21"
  • Configuration: Center/Center
  • Case Size/Shape: 4.25"H x 7.88"W x 16"L Oval
  • Connection: Un-Notched (connects via welds)


Note: Professional installation is highly recommended. Borla and/or Phastek are not responsible for damage to your vehicle.

Note: There is no logo embossment on this part.

Warranty Information (opens in new tab): Click HERE

Part Number: 400371

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Warranty Information

BORLA® stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.
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