Impreza88,
First, not posting in the correct forum is a real good way to tick off the mods. This thread belongs in the Aftermarket Forced Induction Thread.
Second, turboing a RS is honestly pointless when you can buy WRX motors for less than $2000. I suggest you start hanging out in the Subaru Conversions Thread:
http://forums.nasioc.com/forums/forumdisplay.php?f=87