I can tell you this, building a VG to 650rwhp will cost an arm and a leg. It wouldnt be far off from a LSx turn key build. And we all know LSx's are easily and cheaply modded to 500rwhp all day long and streetable and reliable. Hell a LS1 with a moderate cam and a Vortech will do 600+ all day long on 8/9lbs of boost. Call LS1 Excitement and talk to Paul. Hes doing turnkey LSx 300zx's. 919-824-3198