Look into Blouch Turbo Inc. - Turbo, turbochargers and performance turbochargers as well for the turbo.

If you're going with meth then the 560's will be fine.

I personally would (and did) get an WWW.ALKYCONTROL.COM kit. The company is local and IMO builds a superior kit (stainless lines, shurflo pump, progressive controller). The website doesnt list a Subru application. Just give 'em a call and he will build you one.