Borla 400489 ProXS Universal Muffler 3" Dual In/Out w/ X-Pipe

Vehicle Fitment

• Universal fit for vehicles/exhaust systems with 3" exhaust piping - not vehicle specific

Features

• Borla ProXS™ universal muffler designed for custom exhaust builds
• Dual 3" inlet and dual 3" outlet configuration for balanced flow
• Internal X-pipe design helps harmonize exhaust pulses for richer tone
• Straight-through free-flow design for improved exhaust flow performance
• Reversible orientation allows flexible installation layout
• Premium T-304 stainless steel construction resists corrosion
• Oval body profile enhances sound and flow characteristics
• Backed by Borla's Million-Mile Warranty

Specifications

• Part Number: 400489
• Series: ProXS™ Universal Muffler
• Main Pipe Diameter: Dual 3" inlet and dual 3" outlet
• Muffler Body Size: Approx. 4" x 9.5" oval
• Overall Length: Approx. 19" (varies by orientation)
• Design: Dual in/out with internal X-pipe
• Material: T-304 stainless steel
• Fitment: Universal (fits compatible 3" exhaust pipe)

Included Components

• 1x ProXS™ universal muffler (Borla 400489)

Product Description

The Borla 400489 ProXS™ Universal Muffler is a performance-ready component engineered for custom exhaust systems or replacement applications that match its 3" inlet and outlet piping. Featuring a dual inlet and dual outlet design with an internal X-pipe, this muffler helps harmonize exhaust pulse timing and improve flow, giving your exhaust note a richer, more aggressive character than many stock mufflers. Its straight-through free-flow design reduces backpressure while the reversible configuration allows installation in multiple orientations to suit your setup.

Constructed from premium T-304 stainless steel for long-lasting corrosion resistance and durability, the 400489 supports a broad range of custom exhaust layouts. Because it's a universal part rather than vehicle specific, it fits any system with compatible 3" exhaust piping, making it a popular choice for builders and enthusiasts working on custom performance exhaust systems. Backed by Borla's Million-Mile Warranty, this muffler offers quality construction, performance-oriented sound, and flexibility for a variety of exhaust projects.