The Borla Pro-XS 40357 is a universal oval muffler measuring 4in x 9.5in oval with a 14in long body and 19in overall length, with a 2.25in offset inlet and 2.25in center outlet. The un-notched necks are designed for weld-in installation; if clamping, use 3in wide band clamps (18003, not included), and the matching notched version is 400478 (use 1in wide band clamps, 18322). The reversible design adds installation flexibility, and the body uses high-quality T-304 austenitic stainless steel with 100% welded construction and a free-flow design. High-temperature continuous-filament fiber acoustic material controls sound, and the natural mill finish can be brushed or polished before installation. It is made in the USA and backed by Borla's Million-Mile Warranty.
Specifications:
- Type: Universal Pro-XS oval muffler, weld-in
- Inlet/Outlet: 2.25in offset inlet / 2.25in center outlet
- Body: 4in x 9.5in oval, 14in long body
- Overall length: 19in
- Necks: Un-notched for weld-in (clamp with 3in wide band 18003)
- Material: T-304 austenitic stainless steel
- Construction: 100% welded, reversible, free-flow, CFF acoustic material
- Finish: Natural mill, can be brushed or polished
- Made in the USA
- Part number: 40357
FAQ
Is the Borla 40357 a universal muffler?
Yes. It is a universal Pro-XS oval muffler with a reversible design that allows flexible installation on a wide range of builds.
Does it weld on or clamp on?
The un-notched necks are designed for weld-in installation. If clamping, use 3in wide band clamps (18003). The matching notched version is 400478, which uses 1in wide band clamps (18322).
What is the inlet and outlet configuration?
It has a 2.25in offset inlet and a 2.25in center outlet on a 4in x 9.5in oval body, 14in long with a 19in overall length.
Is this muffler street legal?
It is a universal muffler sold as a component. Emissions legality depends on the complete exhaust system and the application, so buyers should confirm the requirements for their specific vehicle and local regulations.
Where is it made and is it warrantied?
It is made in the USA and backed by Borla's Million-Mile Warranty.
