Developed for truck applications and other applications that require a long body muffler. Developed for truck applications and other applications that require a long body muffler. Previous part number was 19131347. This muffler is considered an "S-Type" muffler when compared to the 7.75" diameter x 24" long body BORLA Specialty mufflers and used on the same application. Notched necks are designed for clamp in installation using 1" wide band style clamps 18327 (clamps not included). Alternate muffler with Un-Notched necks is 401664. If clamping alternate muffler, use wide (2 bolt style) band clamps. Reversible design for installation flexibility. High-quality T-304 austenitic stainless steel for superior corrosion resistance. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it's made in the USA and backed by BORLA(r)'s Million-Mile warranty. Part number was 19131347.