Borla 400490 ProXS Universal Muffler Oval (2.5" Inlet/Outlet, Offset/Offset)

Vehicle Fitment

• Universal fit -- for cars, trucks or SUVs with 2.5" exhaust piping and room for an oval muffler

Fitment Notes

• Universal muffler -- requires custom exhaust piping or adaptation for proper fitment.
• Offset-inlet / offset-outlet design -- ensure clearance and alignment when installing.
• Sold as single muffler -- may require clamps, hangers, or additional piping for complete installation.

Features

• Austenitic T-304 stainless-steel construction -- resists rust and corrosion for long life.
• Straight-through core design for reduced back-pressure and improved flow.
• Oval 4" x 9.5" body, compact 14" length -- fits many mid-size exhaust setups.
• Offset 2.5" inlet and outlet for flexible installation orientation and easier fitment in tight chassis layouts.
• Clamp-on installation friendly -- reversible design with notched necks for secure clamping.
• Delivers a deep, mellow exhaust tone -- more aggressive than stock, yet street-legal and manageable.
• Lightweight and compact -- suitable for custom exhaust builds, repairs, or performance-upgrade projects.
• Backed by Borla's Million-Mile warranty -- built to OEM-quality standards for longevity and reliability.

Specifications

• Part Number: 400490
• Muffler Series: ProXS
• Body Dimensions: 4" x 9.5" oval; 14" length (muffler body)
• Overall Length (approx): 19"
• Inlet / Outlet Diameter: 2.5" (offset inlet and offset outlet)
• Material: T-304 stainless steel (rust-free)
• Installation: Clamp-on (notched necks); reversible orientation
• Configuration: Single muffler (universal) -- sold individually
• Warranty: Million-Mile Warranty (manufacturer)

Included Components

• 1x Borla 400490 ProXS universal muffler
• No additional clamps, piping, or hangers included (use with compatible exhaust hardware)

Product Description

The Borla 400490 ProXS universal muffler is a versatile, high-quality exhaust component designed to fit a wide variety of vehicles. Constructed from rust-proof T-304 stainless steel with a straight-through core, it offers excellent exhaust flow, improved throttle response, and a deeper, richer exhaust note than most stock mufflers -- while remaining manageable for daily driving. Its compact 4" x 9.5" oval body and 2.5" offset inlet and outlet make it a flexible choice for custom exhaust systems, repairs, or performance upgrades when you need a reliable muffler that fits in tight or unconventional exhaust layouts.

Because the 400490 is a universal muffler, installation requires appropriate piping and clamps (not included), and fitment clearance should be verified before purchase. Once installed, it enhances exhaust flow, reduces back-pressure, and helps unlock slight gains in power and efficiency while giving a clean, performance-oriented exhaust tone. Backed by Borla's Million-Mile warranty and built to OEM-spec stainless-steel standards, it's a solid choice for anyone building or upgrading a custom exhaust system.