Originally Posted by Nihilanthic
Also, supposedly someone got 400 whp from a stock S4. I forgot where the thread is, though.
I remember that one, it was with a Hybrid turbo. hitachi hot side with a to4e compressor and wheel ported wastegate etc.
The 20 G will spool pretty quickly, maybe a little restricitve though, it seems that most of the guys looking at 06's are useually looking for the 25 g housing instead.