The Borla ProXS muffler is a universal, free-flowing performance muffler. The notched necks are designed for easy clamp-on installation using 1 inch wide band style clamps (part 18322, clamps not included). The reversible design adds installation flexibility. It is built from high quality T-304 austenitic stainless steel with 100 percent welded construction and a 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
- Inlet: 2.25 in offset
- Outlet: 2.25 in center
- Body: 4 in x 9.5 in oval x 14 in long
- Overall length: 19 in
- Necks: Notched, clamp-on (1 in band clamps 18322)
- Material: T-304 austenitic stainless steel
- Construction: 100 percent welded
- Acoustic material: High-temperature continuous-filament fiber
- Made in the USA
- Part number: 400478
FAQ
Will this muffler fit my vehicle?
It is a universal muffler, not vehicle-specific. The notched necks clamp on using 1 inch wide band clamps (part 18322) or can be welded in. 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.
How does it install?
The notched necks are designed for easy clamp-on installation using 1 inch wide band style clamps (part 18322), which are not included.
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 austenitic stainless steel with 100 percent welded construction, handmade in the USA and backed by the Borla Million-Mile warranty.
