Borla 400436 Specialty Heavy-Duty Truck Muffler, 3-Inch Center Inlet and Outlet, 24-Inch Body, Un-Notched Necks

The Borla 400436 Specialty Muffler is designed for trucks and other applications requiring a long-body performance muffler. This universal muffler features a single 3-inch center inlet and single 3-inch center outlet with un-notched necks intended for weld-in installation. Its reversible design provides installation flexibility, while the round body configuration supports a range of custom exhaust system layouts. When clamping is preferred, Borla recommends using 3-inch wide-band clamps, such as the 18006.
Constructed from high-quality T-304 austenitic stainless steel, the Borla 400436 delivers excellent corrosion resistance for dependable long-term service. Its fully welded construction provides strength and durability, while the free-flow design helps promote efficient exhaust performance. High-temperature continuous-filament fiber acoustic material helps control sound without compromising the muffler’s performance-oriented design. The natural mill finish may be brushed or polished before installation for a customized appearance.
The 400436 is a performance-grade universal muffler with a 24-inch body and center-positioned connections. It is an un-notched-neck alternative to Borla part number 400500, which uses notched necks. The muffler is made in the USA and backed by Borla’s Million-Mile Warranty. Professional fabrication and installation are recommended to ensure proper alignment, welding, clearance, and exhaust-system fitment. This product carries a California Proposition 65 warning related to potential exposure to chemicals during operations such as welding, brazing, or thermal cutting.