-10%
Click to zoom in
SKU: 40357 | UPC: 808422403573
Borla 40357 ProXS Muffler - Universal 2.25in Offset Inlet/2.25in Center Outlet 4in x 9.5in Oval x 14in Long Body
The Borla 40357 ProXS Muffler delivers performance exhaust upgrades for custom applications on cars, trucks, and SUVs with 2.25-inch piping. This reversible oval muffler (14-inch body length, 19-inch overall) provides the Borla Sound of Power, added horsepower, torque gains, improved fuel economy, and extended engine life. Install it to experience throttle response and a motorsport-inspired tone in any setup.
Key Features
- Reversible Design: Offset inlet/center outlet configuration switches for flexible routing in tight spaces or custom layouts.
- T-304 Stainless Steel: Austenitic grade resists corrosion and heat for lasting performance in all conditions.
- 100% Welded Construction: Ensures maximum strength and durability under extreme exhaust pressures and temperatures.
- Free-Flow Design: Increases exhaust velocity for measurable boosts in power, torque, and efficiency.
- CFF Acoustic Material: High-temperature continuous-filament fiber tunes deep, aggressive sound with precise drone control.
Product Notes
- Natural mill finish allows brushing or polishing before installation for custom appearance.
- Body dimensions: 14in length x 4in height x 9.5in width; overall length 19in for versatile underbody fit.
- Universal part suits street, off-road, and racing exhaust builds; pipe connect type with 2.25in inlet/outlet diameters.
Installation Notes
- Professional installation recommended.
- Slip-fit pipe connections; weld or clamp to existing 2.25in system—no hardware included.
- Reversible orientation supports center or offset positioning based on vehicle clearance.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | All | Custom 2.25in Exhaust Systems |
Why Choose Borla?
- Pioneer in stainless steel exhaust for classics like Rolls-Royce and Ferrari to modern performance vehicles.
- Delivers power, torque, fuel economy, and distinctive exhaust sound worldwide.
- Engineered for street, off-road, and racing with precision manufacturing.
Frequently Asked Questions
-
Q: Will this muffler fit my specific vehicle?
A: Yes, as a universal part #40357 it fits any custom exhaust with 2.25in piping; measure clearance for oval shape (4x9.5in body). -
Q: What material is used and does it rust?
A: T-304 austenitic stainless steel provides rust resistance and maintains shape under high heat. -
Q: What warranty coverage is included?
A: Borla backs the 40357 ProXS Muffler with a Million-Mile Limited Warranty against defects.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure Borla box, approx. 20in x 10in x 6in
- Weight: 7.3 lbs
Read More
Borla
Discover the Borla Exhaust Systems collection at Black Ops Auto Works, featuring premium American-made exhaust solutions engineered for superior performance, sound, and durability. With decades of innovation and multiple U.S. patents, Borla exhaust systems are trusted by enthusiasts seeking aggressive tone, optimized airflow, and vehicle-specific fitment. Borla Cat-Back & Axle-Back Exhaust Systems Upgrade your vehicle’s sound and performance with Borla cat-back exhaust systems engineered to deliver increased horsepower, improved exhaust flow, and signature Borla tone. For targeted sound enhancement and rear-section upgrades, explore Borla axle-back exhausts, designed for easy installation and refined acoustics. Borla Mufflers, Resonators & Exhaust Components Fine-tune exhaust tone and volume using Borla performance mufflers and Borla exhaust resonators, precision-tuned for optimal sound control and airflow efficiency. Supporting components like Borla mid-pipes, X-pipes, and ... View Our Borla Products...
Exhaust Systems
Find the right performance exhaust system for your car, truck, or SUV with our curated selection of stainless-steel upgrades engineered for power, sound, and reliability. Browse proven layouts like cat-back, axle-back, and turbo-back systems, dial in flow with headers & manifolds and downpipes, or tailor your tone with mufflers & resonators and polished exhaust tips. We also stock emissions-minded solutions including direct-fit catalytic converters and universal catalytic converters. Shop top brands such as Akrapovič, AWE Tuning, Borla, Invidia, GReddy, Perrin, Banks Power, and Gibson. Every option is selected for quality construction (think mandrel-bent tubing and precise welds) and bolt-on fitment, and our Year/Make/Model search makes it easy to match parts to your build—upgrade throttle response, unlock a deeper, refined exhaust note, and enhance your vehicle’s style with components that deliver performance you can feel. View Our Exhaust Systems Products...
Mufflers
Welcome to our Mufflers collection, where performance meets style. Our curated selection offers a variety of mufflers to enhance your vehicle’s sound and efficiency. Whether you’re looking for a subtle upgrade or a loud statement piece, we have the perfect options for you. Why Choose Our Mufflers? High-Quality Materials: Crafted from durable materials to ensure longevity and reliability. Performance Enhancement: Designed to improve your vehicle’s exhaust flow and overall performance. Stylish Designs: Available in various styles to suit your personal taste and vehicle aesthetics. Easy Installation: Many of our mufflers come with easy-to-follow installation instructions for a hassle-free upgrade. Featured Products Check out some of our top-selling mufflers: Performance Muffler X1: Boosts horsepower while providing a deep, aggressive sound. Eco-Friendly Muffler Series: Designed to reduce emissions without compromising on performance. Customizable Muffler Kit: Personalize you... View Our Mufflers Products...