FMF SIL ATC 250 '85-86, FMF Part Number: 78-1140-WPS, Stock photo - actual parts may vary. Extruded from 6060-t6 aluminum alloy with factory replica stainless steel endcaps Completely repackable Powercore ii measures 96 db. and the turbinecore ii is at 94 db. Fits stock pipes as well as aftermarket pipes