SKU: 40658 | UPC: 808422406581
Borla 40658 ProXS Muffler – 2.25″ Center Inlet/Offset Outlet 4.25×7.88″ Oval 14″ Body Universal
The Borla 40658 ProXS Muffler delivers aggressive exhaust tone and performance gains for custom exhaust systems on cars, trucks, and SUVs with 2.25″ piping. Its reversible design allows center inlet/offset outlet or offset inlet/center outlet configuration to fit tight spaces under the vehicle. Install this universal muffler to gain power, torque, better fuel economy, and the renowned Borla Sound of Power.
Key Features
- Compact Oval Shape: 4.25″ height x 7.88″ width x 14″ body length (19″ overall) slides into restricted areas without compromising flow or sound.
- Reversible Design: Mount with 2.25″ center inlet/offset outlet or flip for offset inlet/center outlet to match any exhaust layout.
- T-304 Stainless Steel: Corrosion-resistant material ensures lifelong durability in harsh conditions.
- 100% Welded Construction: Mandrel-bent and fully welded for maximum structural integrity and leak-free performance.
- Free-Flow with CFF Acoustic Core: High-flow passages paired with continuous-filament fiber material refine sound while increasing horsepower and throttle response.
Product Notes
- Universal fit for DIY or professional custom exhaust builds; measure 2.25″ piping clearance before ordering.
- Natural mill finish accepts brushing or polishing for custom appearance.
- Ships fully assembled; handles via standard ground freight.
Installation Notes
- Professional installation recommended.
- Reversible orientation simplifies routing around frame rails or crossmembers.
- Uses slip-fit pipe connections; secure with 2.25″ band clamps (sold separately).
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| All Years | Universal | Custom Exhaust Systems | 2.25″ Piping Required |
Why Choose Borla?
- Leaders in stainless steel exhaust since pioneering systems for classics like Rolls-Royce and Ferrari.
- Engineered for power, torque, efficiency gains, and distinctive sound in street, off-road, and racing applications.
- Precision manufacturing with T-304 steel and advanced acoustic technology for reliable performance.
Frequently Asked Questions
- Q: Will this muffler fit my vehicle?
A: Yes, as a universal part it fits any setup with 2.25″ piping; verify underbody clearance for the 4.25×7.88″ oval body. - Q: What material is used and can it be polished?
A: Constructed from T-304 austenitic stainless steel with mill finish that polishes to a mirror shine. - Q: What warranty covers this muffler?
A: Backed by Borla’s Million-Mile Warranty against defects in materials and workmanship.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Borla-branded box, 20″ L x 8″ W x 8″ H
- Weight: 7 lbs
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