Borla Universal Oval Transverse Flow Muffler 2.5" Inlet / Dual 2.5" Outlet (40477)
Optimize your rear exhaust packaging and maximize horse power with the Borla Universal Oval Transverse Flow Muffler. Originally popularized for GM F-Body vehicles like the Camaro and Firebird to mount parallel behind the rear axle, this specialty transverse-flow muffler is the ideal solution for tight underbody spaces and custom dual-exit exhaust fabrications. It features a high-performance, straight-through free-flow internal engineering layout that eliminates restrictive backpressure to radically improve exhaust gas velocity, horsepower, and torque. The specialty design delivers a deep, aggressive muscle car rumble under load while utilizing advanced continuous-filament fiber acoustic materials to maintain drone-free cruising comfort.
Built to handle extreme temperatures and severe street conditions, this heavy-duty muffler features a 100% welded chassis manufactured from premium T-304 austenitic stainless steel for ultimate protection against rust and corrosion. The unique configuration features a single 2.5-inch offset inlet and dual 2.5-inch offset outlets, with the inlet and one outlet sharing one end cap while the second outlet exits the opposite end. Its smooth, un-notched necks are specifically optimized for a clean weld-in installation by custom fabricators, though they can be secured using heavy-duty wide two-bolt style band clamps. Reversible for total engineering flexibility and finished in a classic natural mill look, this American-made unit is backed by Borla's legendary Million-Mile Warranty.
Features
- Straight-through free-flow performance layout reduces backpressure to unlock horsepower
- Classic muscle car sound signature with high-temperature continuous-filament fiber (CFF) acoustic control
- Manufactured from 100% welded, premium T-304 austenitic stainless steel for lifetime durability
- Specialty transverse flow packaging fits parallel to the rear axle or tight custom applications
- Unique configuration: Single 2.5" offset inlet and dual 2.5" offset outlets distributed across both ends
- Features smooth, un-notched necks optimized for direct weld-in custom exhaust fabrication
- Proudly made in the USA and backed by a Million-Mile Warranty
Fitment
- Universal Fitment
- GM F-Body Applications (Camaro / Firebird)
- Universal Custom Transverse & Rear-Mount Exhaust Configurations
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
