SKU: 400491 | UPC: 808422004916
Borla 400491 ProXS Muffler 3in Offset Inlet/3in Offset Outlet 4×9.5 Oval 14in Body Notched Necks Universal
The Borla 400491 ProXS muffler is a universal oval performance muffler designed for custom exhaust systems on trucks, cars and SUVs with 3-inch piping. This reversible notched design clamps on easily to boost horsepower, torque and fuel efficiency while producing the signature Borla Sound of Power. Add motorsport styling and extended engine life to any ride with this free-flowing upgrade.
Key Features
- Notched Necks: Enable direct clamp-on installation without welding for fast, secure fit on 3-inch pipes.
- Reversible Design: Allows flexible inlet/outlet positioning to match any exhaust layout.
- T-304 Stainless Steel: Resists rust and corrosion with 100% welded construction for lasting strength.
- Free-Flow Technology: Increases exhaust velocity for measurable gains in power and throttle response.
- CFF Acoustic Core: Controls drone and refines tone for a deep, aggressive exhaust note.
Product Notes
- Natural mill finish allows brushing or polishing before install.
- Clean regularly with mild soap to maintain stainless appearance.
- Ships in protective box; inspect upon arrival for any transit damage.
Installation Notes
- Professional installation recommended.
- Clamp-on design fits 3-inch piping; no cutting or fabrication needed.
- Use high-quality exhaust clamps (sold separately) for secure mounting.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | Custom Exhaust Builds | 3″ Piping Required |
Why Choose Borla?
- Pioneered stainless steel exhaust for classics like Ferrari and Rolls-Royce, now leading street and racing.
- Builds systems that deliver real power, torque and efficiency gains.
- Engineered in the USA with Million-Mile warranty for proven reliability.
Frequently Asked Questions
- Q: Does this muffler fit my vehicle?
A: Yes, as a universal part with 3-inch offset inlet/outlet and notched necks, it fits any custom exhaust system using 3-inch piping on cars, trucks or SUVs. - Q: What material is used?
A: High-grade T-304 austenitic stainless steel construction ensures rust resistance and durability under high heat. - Q: What warranty applies?
A: Backed by Borla’s Million-Mile warranty covering defects in materials and workmanship.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Cardboard box 20 x 10 x 6 inches
- Weight: 8.1 lbs (shipping weight 10 lbs)
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