The Borla ProXS muffler is a universal, free-flowing performance muffler with a dual inlet and dual outlet and an internal X-Pipe for increased performance and improved sound. The un-notched necks are designed for weld-in installation; if clamping, use 3 inch wide band clamps (part 18003, clamps not included). The reversible design adds installation flexibility. It is built from T-304 stainless steel with 100 percent welded construction and high-temperature continuous-filament fiber acoustic packing for sound control. The natural mill finish can be brushed or polished prior to installation. Borla exhaust products are handmade in the USA and backed by the Borla Million-Mile warranty.
Specifications:
- System type: Universal ProXS muffler, reversible, internal X-Pipe
- Inlet: 2.25 in dual
- Outlet: 2.25 in dual
- Body: 4 in x 9.5 in oval x 19 in long
- Overall length: 24 in
- Necks: Un-notched, weld-in (3 in band clamps 18003 if clamping)
- Material: T-304 stainless steel
- Construction: 100 percent welded
- Acoustic material: High-temperature continuous-filament fiber
- Made in the USA
- Part number: 400287
FAQ
Will this muffler fit my vehicle?
It is a universal muffler, not vehicle-specific. It is designed to be welded into a custom or existing dual inlet, dual outlet exhaust system, or clamped using 3 inch wide band clamps (part 18003). Confirm the inlet and outlet sizing and available space match the application.
Is this muffler street legal or emissions compliant?
As a universal exhaust component it carries no standalone emissions certification. Emissions legality depends on the complete exhaust system and how it is configured on the vehicle and in the state where it is registered.
What does the internal X-Pipe do?
The internal X-Pipe balances exhaust pulses between the two sides for increased performance and an improved exhaust note.
Can it be installed in either direction?
Yes. The reversible design allows the muffler to be installed in either orientation.
What is it made from and where?
It is built from T-304 stainless steel with 100 percent welded construction, handmade in the USA and backed by the Borla Million-Mile warranty.
