Borla 40057 Boomers Thumper Performance Muffler 2.25" Inlet 4" Tip -Universal

Vehicle Fitment

• Universal--suitable for most vehicle exhaust systems with 2.25" inlet and rear 4" outlet

Fitment Notes

• Center-inlet, center-outlet configuration--fits custom or OEM exhaust layouts
• Requires 2.25" exhaust piping; adapters may be needed for other setups
• Intended for aftermarket exhaust systems--verify clearance before installation

Features

• 100% T-304 stainless steel construction--durable and corrosion-resistant
• High-temperature CFF acoustic packing for race-proven sound control
• 2.25" center inlet, single 4" polished tip for aggressive tone
• Straight-through baffled design--enhances horsepower by 7-10%
• Fully welded for strength and longevity
• Natural mill finish--can be polished or brushed
• Made in the USA and backed by Borla's Million-Mile Warranty
• Universal mounting--versatile for custom or bolt-on applications

Specifications

• Construction: T-304 stainless steel, fully welded
• Inlet: 2.25" (57 mm) center
• Outlet tip: 4" (101.6 mm) center
• Body dimensions: approx. 14" L x 4.5" W x 7.88" H
• Overall length: ~23.5"
• Material: stainless steel
• Drivetrain: universal
• Warranty: Million-Mile from Borla

Included Components

• 1x Borla Boomers Thumper muffler (PN 40057)

Product Description

The Borla 40057 Boomers Thumper muffler is a universal, high-performance exhaust component built with T-304 stainless steel and race-tested CFF acoustic lining. With a straight-through baffled design, 2.25" inlet, and 4" polished tip, this muffler delivers a distinctive aggressive tone while providing a modest horsepower gain of 7-10%. Its fully welded construction ensures durability under extreme conditions.

Boasting a natural finish that can be customized, the 40057 fits most custom or stock exhaust systems--just confirm piping size and tip clearance before purchase. Designed for street or track use, it offers bold sound without drone. Proudly made in the USA and backed by Borla's Million-Mile Warranty, this muffler is ideal for enthusiasts looking to enhance performance and aesthetics with a universal fit.

Fitment is universal; however, ensure your exhaust has a 2.25" inlet and space for a 4" outlet. Adapter piping may be required. Not CARB-legal in California (Prop 65 warning applies). Ideal for custom builds, hot rods, trucks, or performance vehicles requiring an aggressive exhaust upgrade.