Notched necks for easy clamp-on installation. Reversible design for installation flexibility. High-quality T-304 austenitic stainless steel will never rust. 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, its made in the USA and backed by Borla(r)s Million-Mile warranty. Just what youd expect from the worlds most experienced (and most winning) exhaust brand.ProXS Muffler 3 Offset Inlet/ 3 Center Outlet, 4 x 9.5 Oval, 14 Long Body, 19 Overall Length. Universal Part. Reversible Design. Notched Necks.Million Mile Warranty