Borla Boomer Thumper Muffler, 2.25-Inch Center Inlet with 4-Inch Round Tip, Part 40057

BORLA(r) Boomers are full-blown, high-tech, dyno and race-proven mufflers for the street or track. These eye-popping, fully polished, T-304 stainless steel mufflers feature integrated polished tips, and utilize BORLA(r)'s patented race-winning technology for improved exhaust flow. In addition to adding head-turning sound, they also add a modest boost in horsepower. They utilize 100% welded construction for strength. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. This muffler features a 4" fully polished tip. Available in a variety of universal-fit styles, BORLA(r) Boomers are made in the USA from aircraft-grade high-quality T-304 austenitic stainless steel and include a Million-Mile Warranty. Thumper Boomers Muffler 2.25" Center Inlet/ Single 4" Round Tip, 4.25" x 7.88" Oval x 14" Long Body 23.5" Overall Length. Universal Part. Million Mile Warranty

• Universal muffler
• Integrated tips
• Fully polished

The Borla Boomer Thumper Muffler is a universal-fit performance muffler engineered for street or track applications. Part 40057 features a 2.25-inch center inlet and an integrated, fully polished 4-inch round outlet tip for a clean, finished appearance without requiring a separate tip installation. Its high-flow design helps improve exhaust flow while delivering a bold, performance-oriented exhaust note and the potential for a modest horsepower improvement.

Constructed from aircraft-grade T-304 austenitic stainless steel, the Borla Boomer uses fully welded construction for long-term strength and durability. High-temperature continuous-filament fiber acoustic material helps control sound while supporting consistent performance under demanding exhaust temperatures. The oval muffler body uses a natural mill finish that can be brushed or polished before installation, while the integrated outlet tip is fully polished. Manufactured in the USA, this universal muffler is backed by Borla's Million-Mile Warranty.

What's Included

• One Borla Boomer Thumper universal muffler
• Integrated polished 4-inch round outlet tip
• Borla Million-Mile Warranty

Fitment: This is a universal muffler and may require custom exhaust fabrication, including inlet, outlet, hanger, and clearance modifications. Verify inlet size, outlet position, body clearance, and vehicle-specific installation requirements before ordering. Professional installation is recommended.

Features:

• Universal Fit: Designed for custom street or track exhaust systems requiring a 2.25-inch center inlet and single integrated outlet.
• High-Flow Performance: Borla race-proven technology helps improve exhaust flow and may provide a modest horsepower gain.
• T-304 Stainless Steel Construction: Aircraft-grade austenitic stainless steel provides excellent corrosion resistance and durability.
• Integrated Polished Tip: Includes a fully polished 4-inch round outlet tip for a streamlined, finished exhaust appearance.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1