SKU: 400485 | UPC: 808422004855
Borla ProXS Muffler 2.5in Center Inlet/ 2.5in Dual Outlet 4in x 9.5in Oval x 19in Long Body Notched Necks
Borla 400485 ProXS muffler delivers performance exhaust upgrades for universal fit on vehicles with 2.5" piping. Single 2.5" center inlet splits to dual 2.5" outlets in a compact 4" x 9.5" x 19" oval body. Expect gains in power, torque, fuel economy plus the aggressive Borla sound from every throttle pull.
Key Features
- T-304 Stainless Steel: High-grade austenitic material resists rust with 100% welded construction for lifelong strength.
- Free-Flow Design: Paired with CFF acoustic core for unrestricted exhaust flow, better throttle response and engine efficiency.
- Notched Necks: Precision cuts enable secure clamp-on fit without welding, saving time on custom installs.
- Reversible Body: Install inlet/outlet orientation to match any exhaust layout for maximum versatility.
- Compact Dimensions: 4" height x 19" body length x 9.5" width, 23" overall length fits tight spaces under most chassis.
Product Notes
- Universal design suits single inlet/dual outlet or dual inlet/single outlet systems with 2.5" pipes.
- Natural mill finish accepts brushing or polishing for custom appearance.
- Made in USA, includes Million-Mile warranty for peace of mind.
Installation Notes
- Professional installation recommended.
- Notched ends accept standard band clamps for bolt-on simplicity.
- Reversible layout and universal hangers ensure compatibility with stock or aftermarket exhaust.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | Performance Vehicles | 2.5" Exhaust Systems |
Why Choose Borla?
- Leaders in stainless steel exhaust since pioneering systems for Ferrari and Rolls-Royce.
- Delivers measurable power, torque and fuel economy in every component.
- Engineered for motorsport wins with precision mandrel-bent designs.
Frequently Asked Questions
-
Q: Will this muffler fit my custom exhaust setup?
A: Yes, universal 2.5" center inlet to dual outlets with notched, reversible necks works on most 2.5" pipe systems; measure clearance for 4x9.5" oval body. -
Q: What material and finish does it have?
A: T-304 stainless steel construction throughout, mill finish ready for polish or brush for show-quality shine. -
Q: What warranty coverage applies?
A: Lifetime Million-Mile warranty covers defects in materials and workmanship when installed per Borla guidelines.
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure Borla box, 28" L x 10" W x 10" H
- Weight: 11.2 lbs
Borla
Borla exhaust systems for cars, trucks, SUVs, and Jeeps are stocked at Black Ops Auto Works. Shop Borla ATAK, S-Type, and Touring cat-back systems, axle-back exhausts, SwitchFire X-pipes, H-pipes, mid-pipes, exhaust tips, and tailpipe kits for Ford Mustang GT, Dodge Challenger Hellcat, Toyota Tacoma and Tundra, Ford F-150 and Super Duty, Jeep Gladiator, RAM 1500, and Chevrolet Corvette platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 1,041 Borla SKUs across cat-back, axle-back, mid-pipe, and exhaust tip categories. What This Brand Covers Borla built its name on premium T304 stainless steel exhaust and a straight-through muffler design that delivers a distinct, aggressive tone without the raspy edge common on lower-cost systems. The lineup spans three core sound profiles so drivers can match a system to their build and daily use. Core Sound Profiles ATAK delivers the mo...
View Borla Products
Exhaust Systems
Performance exhaust systems for cars, trucks, SUVs, and Jeeps are stocked at Black Ops Auto Works. Shop cat-back systems, axle-back systems, turbo-back systems, headers, downpipes, mid-pipes, mufflers, resonators, catalytic converters, exhaust tips, exhaust valve controllers, oxygen sensors, exhaust brakes, and motorcycle and powersports exhausts for Mustang, Camaro, Challenger, Corvette, Silverado, and Super Duty platforms. Every product is filterable by exhaust position, material, pipe diameter, and vehicle year, make, model, and trim so the correct fitment ships the first time. Black Ops Auto Works carries 7,441 exhaust SKUs across every position of the exhaust system. What This Category Covers Exhaust upgrades change sound, appearance, and in some cases power. Exhaust fitment depends on engine, drivetrain, and factory exit position, so confirm the exact platform before ordering any exhaust component. Exhaust Position Cat-back, axle-back, turbo-back, and header-back systems e...
View Exhaust Systems Products
Mufflers
Performance mufflers for street, track, and show builds are stocked at Black Ops Auto Works. Shop chambered mufflers, straight-through mufflers, tuned resonators, slip-on exhaust systems, and universal weld-in mufflers in stainless steel and titanium for HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, EcoBoost, Porsche, BMW, and import platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 434 muffler SKUs across inlet size, outlet configuration, and sound level categories. What This Category Covers The Mufflers collection spans direct-fit muffler replacements, universal weld-in mufflers for custom exhaust builds, and complete slip-on exhaust systems for European sports cars. The catalog is strongest on Gibson, Corsa, MagnaFlow, MBRP, and GReddy mufflers for domestic trucks and muscle cars, with premium Akrapovic titanium slip-on systems for Porsche, BMW, and Ferrari platform...
View Mufflers Products
Mufflers & Resonators
Mufflers and resonators for cars, trucks, SUVs, and Jeeps are stocked at Black Ops Auto Works. Shop chambered mufflers, straight-through mufflers, turbo mufflers, muffler silencers, muffler delete pipes, standalone resonators, and slip-on exhaust systems for Mustang, Camaro, Challenger, Corvette, Wrangler, F-150, and import turbo platforms. Every product is filterable by inlet and outlet diameter, body size, overall length, and vehicle year, make, and model so the correct fitment ships the first time. Black Ops Auto Works carries 496 muffler and resonator SKUs across universal and direct-fit applications. What This Category Covers Mufflers and resonators are the sound-shaping heart of any exhaust system. A muffler controls overall volume and tone at the tailpipe, while a resonator upstream tames specific drone frequencies before they reach the cabin. Builders mix and match the two to dial in a sound profile that fits daily driving or track use. Muffler Types Chambered mufflers u...
View Mufflers & Resonators Products


