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Borla® 40057 - Thumper

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Borla® 40057 - Thumper

4"Diameter Tip.  SKU# 10965

Product Description

  • Stainless Steel Oval Thumper Race Exhaust Muffler
  • Improves exhaust flow for better performance
  • Increases horsepower 7-10%
  • Dyno and race proven
  • Pronounced exhaust tone
  • Patented straight-through muffler design reduces backpressure while absorbing sound waves

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