Borla 40057 | Exhaust Muffler

Part Number
Borla Boomers Thumper Muffler; Center/Center; 2.25 in. Inlet; 4 in. Round Tip; 14 in. x 4.25 in. x 7.88 in. Case Size; 23.5 in. Overall Length; Oval Body; T-304 Stainless Steel
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BORLA(R) BOOMERS(TM) — Full blown, high-tech, dyno and race-inspiredmufflers for the street or track. These eye-poping, fully polished mufflersutilize BORLAs patented race-winning technology. They boost horsepower7-10 while adding head-turning sound. Available in a variety ofuniversal-fit styles, BORLA(R) Boomers are made of high quality300 Series austenitic stainless steel and are backed by aMillion Mile Warranty.

BRAND: Borla


  • Borla® Boomers Thumper Muffler
  • Add Head Turning Sound
  • Dyno And Race Proven Mufflers
  • Rear Mounted Muffler With Tip
  • Fully Polished
  • Million Mile Warranty
  • Boost Horsepower 7 To 10 Percent
  • Borla® Boomers Thumper Muffler; Center/Center; 2.25 in. Inlet; 4 in. Round Tip; 14 in. x 4.5 in. x 7.88 in. Case Size; Oval Body; T-304 Stainless Steel;


Body Height7.880 in.
Body Length14.000 in.
Body Width4.500 in.
Inlet Connection TypePipe
Inlet Inside Diameter2.250 in.
Inlet Outside Diameter2.250 in.
Inlet PositionCenter
Inlet TypeSingle Center
Main Piping Diameter2.250 in.
Material304 Stainless Steel
Muffler Count1
Outlet Outside Diameter2.250 in.
Outlet PositionCenter
Outlet TypeSingle Center Outlet
Overall Length19.000 in.
Tip Quantity0
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: This product in the physical form it is sold does not present a hazard. However; operations including; but not limited to welding; brazing; or thermal cutting can expose you to chemicals including Chromium; Nickel; Cobalt; Arsenic; Cadmium and Lead which are known to the State Of California to cause cancer; birth defects and other reproductive harm. For more information go to


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