?This baffle is not designed to replace, but it does fit the same applications as the current offering 450-376. This all new baffle will provide an additional option for consumers to reduce dBs even further than that of the standard quiet baffle? The quietest baffle available? Maintains deep rumble? Fits these seiest for Vance & Hines exhaust pipes Bigshot Staggered, Bigshot Longs, Bigshot Duals, Straightshot HS slip-ons, Straightshots, Longshots HS, Softail Duals, Sideshots, Shortshot Staggered? Fits these specific pipes: 901-469440-828901-551441-938542-535450-432441-946442-347443-674450-787450-788450-789441-931441-942441-389103-178451-037451-039451-038440-839351-174563-424441-671441-739441-941534-989441-190441-670533-999532-787441-930103-377441-797441-799441-798441-679534-990534-000103-378533-998533-779