SKU: 40344 | UPC: 808422403443
Borla ProXS Muffler 2in Offset Inlet/2in Center Outlet 4in x 9.5in Oval x 14in Long Body #40344
The Borla 40344 ProXS Muffler is a universal oval performance muffler with 2-inch offset inlet/2-inch center outlet in a reversible design, 4 x 9.5-inch oval body, 14-inch body length and 19-inch overall length. Built for custom exhaust systems on cars, trucks and SUVs with 2-inch piping, it provides the Borla Sound of Power, increases in horsepower and torque, better fuel economy and responsive throttle feel. Add motorsport styling and a heart-pounding exhaust note to any ride.
Key Features
- Reversible Design: Configure as offset inlet/center outlet or center inlet/offset outlet for installation flexibility in tight spaces.
- T-304 Stainless Steel: Austenitic construction resists rust and corrosion for long-lasting performance in all conditions.
- 100% Welded Build: Full welds ensure maximum strength and durability under high heat and pressure.
- Free Flow Technology: Mandrel-bent internals improve exhaust scavenging for power and torque gains across RPM range.
- CFF Acoustic Core: High-temperature continuous-filament fiber controls sound levels while maintaining flow efficiency.
Product Notes
- Universal part suitable for custom exhaust fabrication; verify 2-inch piping compatibility.
- Natural mill finish allows brushing or polishing before install for custom look.
- Ships in protective packaging; 7.8 lbs product weight.
Installation Notes
- Professional installation recommended.
- Slip-fit necks work with clamps or welding on 2-inch exhaust pipe.
- Reversible orientation simplifies routing in center or rear muffler positions.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | Various | Custom Exhaust | 2in Piping Vehicles |
Why Choose Borla?
- Pioneer and leader in stainless steel performance exhaust for street, off-road and racing.
- Boosts power, torque, fuel economy and engine life with every upgrade.
- Engineered for the thrill of throttle response and distinctive exhaust soundtrack.
Frequently Asked Questions
-
Q: What vehicles fit the Borla 40344 ProXS Muffler?
A: Universal design for custom installs on most cars, trucks and SUVs with 2-inch exhaust piping; measure your system for exact match. -
Q: What material and finish does it have?
A: T-304 austenitic stainless steel with natural mill finish; polish or brush as desired, resists rust indefinitely. -
Q: What warranty covers this muffler?
A: Backed by Borla's Million-Mile Limited Warranty against manufacturing defects when installed and used properly.
Shipping & Handling
- Method: Ground shipping via UPS or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure Borla box, 20.5 x 10.5 x 5 inches
- Weight: 7.8 lbs

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