Borla 400373 ProXS Universal Muffler 2.5" Dual In/Out w/ X-Pipe Design

Vehicle Fitment

• Universal fit for vehicles/exhaust systems with 2.5" exhaust piping - not vehicle specific

Features

• Borla ProXS™ universal muffler designed for custom exhaust applications
• Dual 2.5" inlet and dual 2.5" outlet for balanced flow
• Internal X-pipe design helps harmonize exhaust pulses and enhance tone
• Reversible orientation for flexible installation layout
• Premium T-304 stainless steel construction for corrosion resistance
• Oval body profile for improved flow characteristics
• Straight-through free-flow design for performance-oriented sound
• Backed by Borla's Million-Mile Warranty

Specifications

• Part Number: 400373
• Series: ProXS™ Universal Muffler
• Main Pipe Diameter: Dual 2.5" inlet and outlet
• Muffler Body Size: Approx. 4" x 9.5" oval
• Overall Length: Approx. 19" (varies by orientation)
• Material: T-304 stainless steel
• Design: Dual in/out with internal X-pipe
• Fitment: Universal (works with compatible 2.5" exhaust piping)

Included Components

• 1x ProXS™ universal muffler (Borla 400373)

Product Description

The Borla 400373 ProXS™ Universal Muffler is a versatile performance muffler engineered for custom exhaust systems or replacements where the exhaust piping is 2.5" in diameter. Featuring a dual inlet and dual outlet configuration with an internal X-pipe, this muffler helps reduce backpressure and harmonize exhaust pulse timing for a richer, more aggressive exhaust tone compared to many stock mufflers. Its reversible design allows installation in multiple orientations to suit your exhaust layout.

Constructed from high-quality T-304 stainless steel, the 400373 is built for durability and corrosion resistance. The straight-through, free-flow body encourages improved exhaust flow while the internal X-pipe combines exhaust streams for a balanced sound. Because it's a universal component, this muffler fits a wide range of custom exhaust applications that match its 2.5" inlet/outlet size. Whether you're building a custom system or replacing an existing component, the Borla ProXS™ 400373 offers performance-ready design backed by Borla's Million-Mile Warranty.