The Borla Pro-XS muffler is a universal, reversible oval muffler for custom and performance exhaust systems. It uses a free-flow center inlet and center outlet with 100 percent welded T-304 austenitic stainless steel construction and high-temperature continuous-filament fiber (CFF) acoustic packing for sound control. The natural mill finish can be brushed or polished before installation, and the notched necks are made for clamp-on installation with 1 inch wide band clamps (clamps sold separately; an un-notched weld-in version is offered as 40364). Borla exhaust is handmade in the USA and backed by the Borla Million-Mile Warranty.
Specifications:
- System type: universal oval muffler, reversible design
- Inlet: 2.5 inch center
- Outlet: 2.5 inch center
- Body: 4 inch x 9.5 inch oval
- Body length: 14 inch
- Overall length: 19 inch
- Neck style: notched for 1 inch wide band clamps
- Material: T-304 austenitic stainless steel
- Construction: 100 percent welded
- Made in the USA
- Part number: 400496
FAQ
What vehicles does the Borla 400496 Pro-XS muffler fit?
It is a universal muffler, not a vehicle-specific part. It fits custom and performance exhaust systems using 2.5 inch center inlet and outlet connections with clearance for a 4 inch by 9.5 inch oval body, 14 inches long and 19 inches overall. Confirm pipe sizing and clearance for your application.
How does it install?
The necks are notched for clamp-on installation with 1 inch wide band style clamps (not included), and the reversible design allows either orientation. An un-notched version for weld-in use is offered under part number 40364.
Is this a 50-state emissions legal or street legal part?
This is a universal weld-in exhaust component, not a complete vehicle-specific system. Emissions compliance and street legality depend on the complete exhaust system and the specific vehicle it is installed on, so a universal part sold on its own carries no standalone emissions certification. Confirm the requirements for your state and application before installing.
Where is it made and is it warrantied?
It is built in the USA from T-304 austenitic stainless steel and is backed by the Borla Million-Mile Warranty.
