-10%
Click to zoom in
SKU: 400487 | UPC: 808422004879
Borla 400487 ProXS Muffler 3in Center Inlet/ 2.5in Dual Outlet 4in x 9.5in Oval x 19in Long Body Notched Necks
The Borla 400487 ProXS Muffler delivers aggressive exhaust tone and performance gains for custom exhaust setups on cars, trucks and SUVs. This universal oval muffler accepts a 3-inch center inlet and routes to dual 2.5-inch offset outlets with a compact 4in high by 9.5in wide by 19in long body and 24in overall length. Gain power, torque, better fuel economy and the signature Borla Sound of Power that excites on every throttle pull.
Key Features
- Notched Necks: Precision cuts allow secure clamp-on connections for straightforward installation without welding.
- Reversible Design: Mount center inlet to dual outlets or reverse for dual inlets to single outlet flexibility in custom systems.
- T-304 Stainless Steel: High-grade austenitic material resists rust and corrosion for lifelong durability in all conditions.
- Free Flow Technology: Mandrel-bent internals enhance exhaust scavenging to increase horsepower, torque and throttle response.
- CFF Acoustic Core: Continuous-filament fiber packing delivers deep, powerful sound while reducing interior drone.
Product Notes
- 100% welded construction ensures structural integrity under high heat and pressure.
- Natural mill finish accepts brushing or polishing for custom appearance.
- Made in the USA with Million-Mile warranty covering defects in materials and workmanship.
Installation Notes
- Professional installation recommended.
- Notched pipe ends compatible with standard exhaust clamps for bolt-on simplicity.
- Verify pipe sizing and routing clearance before install; reversible orientation suits most layouts.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | All | Custom Exhaust Systems - 3in Pipe Compatible |
Why Choose Borla?
- Decades as leader in stainless steel exhaust for street, off-road and racing vehicles.
- Proven designs deliver measurable power increases and iconic exhaust note.
- Precision engineering from concours classics to modern performance machines.
Frequently Asked Questions
-
Q: Does this muffler fit specific vehicles?
A: Designed as universal for custom systems with 3in inlet piping; check your exhaust diameter and layout for compatibility. -
Q: What material is used in construction?
A: T-304 austenitic stainless steel throughout, fully welded for maximum strength and rust resistance. -
Q: What warranty coverage applies?
A: Backed by Borla's Million-Mile warranty against defects when installed and maintained properly.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Securely boxed, approximately 26in L x 11in W x 11in H
- Weight: 9 lbs
Read More
Borla
Discover the Borla Exhaust collection, where world-class exhaust products meet the high standards of automotive enthusiasts. Borla is dedicated to exceeding your expectations by utilizing a state-of-the-art test and development center. This facility allows us to continually refine our manufacturing precision and maintain the highest quality standards. Our commitment to innovation is evident through numerous US patents for advanced exhaust design and multiple "Best New Product" awards in the industry. Unmatched Customization What sets Borla apart from other exhaust systems is our vehicle-specific design approach. Each exhaust system is meticulously crafted to accommodate the unique mechanical and acoustical properties of different cars and trucks. We invest countless hours in optimizing various components, such as: Muffler body shapes Internal core configurations Flow dynamics Sound characteristics Exclusive Sound Technologies Borla offers a choice of three exclusive sound techno... 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...