Developed for truck applications and other applications that require a long body muffler. Previously part number 19131346. This muffler is considered a "Touring" muffler when compared to the 400130 and used on the same application. Notched necks for clamp-on installation using 1" wide band style clamps 18327 (clamps not included). Alternate muffler with Un-Notched necks is 401665. If clamping, use 3" wide band clamps 18005. Reversible design for installation flexibility. High-quality T-304 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. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.