This Billet Steel S400 Compressor Outlet Flange for 3.5" Pipe with O-Ring Groove is CNC machined from 6061-T6 aluminum in DeKalb, IL USA by WCFab. Part is ready to weld up for DIY fabricators building custom turbocharger kits or intercooler piping allowing for a direct v-band connection to a Borg Warner S400 style turbocharger compressor cover. V-band Clamp and O-ring Seal sold separately. See models WCF203-21 and WCF203-40.