i know blitz uses that on in one of ther turbo kits..or is it a K27??
anyway..is that regular T3 or euro T3 flange??...i jus found out about those...so that too is a consideration seein as how it came off an audi
oh...its a german turbo..common on VWs, Audis, and porsche..maybe mercedes..idk
edit: yup jus checked its a K27 for an FD...if its an upgrade for an FD it must be decent and big...even though its a K26 it should be ok
edit #2
http://splparts.com/Silvia/Turbo/TurboKit.asp <---there is a kit for an S14 using the K26 and the K27