Borla Boomer Thumper Oval Muffler 2-1/4in In 4in Side Out — Universal Fit

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SKU: BOR40057
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About Borla Borla Performance Industries was founded in 1978 and ...Read More

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Sale price$298.99 Regular price$334.99
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Borla

Borla Performance Industries was founded in 1978 and remains America's premium cat-back exhaust brand. Every Borla system is hand-built from T-304 austenitic stainless steel and backed by a million-mile warranty — the OE choice for Camaro ZL1, Mustang GT350, and Chevy Corvette.

Watch in action

Race-Proven Exhaust Performance

The Borla Boomer Thumper is a high-tech, dyno-proven muffler designed for those who want to be heard. Whether you are building a street machine or a dedicated track car, this muffler provides the aggressive sound and improved exhaust flow necessary for maximum performance gains. Crafted from aircraft-grade T-304 stainless steel, it offers superior durability and corrosion resistance compared to lower-grade materials.

Why Choose Borla Boomers?

  • Material: T-304 austenitic stainless steel
  • Construction: 100% welded for maximum strength
  • Sound Control: Continuous-filament fiber (CFF) acoustic material
  • Design: Integrated polished tips for a sleek look
  • Warranty: Industry-leading Million-Mile Warranty

These mufflers are engineered to reduce backpressure, allowing your engine to breathe easier and produce more horsepower. The natural mill finish can be polished to a mirror shine or brushed for a custom aesthetic. Borla’s patented technology ensures that you get a deep, throaty exhaust note that turns heads at every stoplight. With a universal fitment design, this muffler is an excellent choice for a wide range of custom exhaust projects. Don't settle for stock exhaust restrictions; upgrade to the legendary quality of Borla and feel the difference in your vehicle's performance. Find your perfect exhaust solution at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Borla

Borla Performance Industries was founded in 1978 and remains America's premium cat-back exhaust brand. Every Borla system is hand-built from T-304 austenitic stainless steel and backed by a million-mile warranty — the OE choice for Camaro ZL1, Mustang GT350, and Chevy Corvette.

Watch in action

Race-Proven Exhaust Performance

The Borla Boomer Thumper is a high-tech, dyno-proven muffler designed for those who want to be heard. Whether you are building a street machine or a dedicated track car, this muffler provides the aggressive sound and improved exhaust flow necessary for maximum performance gains. Crafted from aircraft-grade T-304 stainless steel, it offers superior durability and corrosion resistance compared to lower-grade materials.

Why Choose Borla Boomers?

  • Material: T-304 austenitic stainless steel
  • Construction: 100% welded for maximum strength
  • Sound Control: Continuous-filament fiber (CFF) acoustic material
  • Design: Integrated polished tips for a sleek look
  • Warranty: Industry-leading Million-Mile Warranty

These mufflers are engineered to reduce backpressure, allowing your engine to breathe easier and produce more horsepower. The natural mill finish can be polished to a mirror shine or brushed for a custom aesthetic. Borla’s patented technology ensures that you get a deep, throaty exhaust note that turns heads at every stoplight. With a universal fitment design, this muffler is an excellent choice for a wide range of custom exhaust projects. Don't settle for stock exhaust restrictions; upgrade to the legendary quality of Borla and feel the difference in your vehicle's performance. Find your perfect exhaust solution at GGCRACING.

Product Details

Product Description

About Borla

Borla Performance Industries was founded in 1978 and remains America's premium cat-back exhaust brand. Every Borla system is hand-built from T-304 austenitic stainless steel and backed by a million-mile warranty — the OE choice for Camaro ZL1, Mustang GT350, and Chevy Corvette.

Watch in action

Race-Proven Exhaust Performance

The Borla Boomer Thumper is a high-tech, dyno-proven muffler designed for those who want to be heard. Whether you are building a street machine or a dedicated track car, this muffler provides the aggressive sound and improved exhaust flow necessary for maximum performance gains. Crafted from aircraft-grade T-304 stainless steel, it offers superior durability and corrosion resistance compared to lower-grade materials.

Why Choose Borla Boomers?

  • Material: T-304 austenitic stainless steel
  • Construction: 100% welded for maximum strength
  • Sound Control: Continuous-filament fiber (CFF) acoustic material
  • Design: Integrated polished tips for a sleek look
  • Warranty: Industry-leading Million-Mile Warranty

These mufflers are engineered to reduce backpressure, allowing your engine to breathe easier and produce more horsepower. The natural mill finish can be polished to a mirror shine or brushed for a custom aesthetic. Borla’s patented technology ensures that you get a deep, throaty exhaust note that turns heads at every stoplight. With a universal fitment design, this muffler is an excellent choice for a wide range of custom exhaust projects. Don't settle for stock exhaust restrictions; upgrade to the legendary quality of Borla and feel the difference in your vehicle's performance. Find your perfect exhaust solution at GGCRACING.

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