4 questions... 1. On ebay they are selling this GSR turbo kit for $575. I've never heard of HKS turbo kits before. Are they any good? link: HKS turbo 2. I have heard some people say the GSR engine isn't the best to turbo charge. Why exactly? 3. I've read that a stock GSR engine can handle a turbo safely if there is good fuel management. True? What would be the max psi for that setup? 4. Engine = 94 GSR with catback and intake. Would it be cheaper and/or more reliable to build my head (port/polish, valves, injectors, skunk IM, throttle body, cams, etc.), or install a Greddy turbo?