HAve a look at the Borg Warner turbo sizing tool online - it is brilliant - as long as you know your way around a compressor map - it will advise on WG dimensions too but I think stock is fine for ~500bhp from memory.
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Paul Nugent
Webmaster http://S2central.net
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1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
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