I have just gotten done with my 1JZ mod and was wondering what I would need to get to 650 horsepower. I have seen some turbo kits on ebay that claim to get you 600 to 650 but I am kinda leery. I know I will need injectors, fuel pump, and a fuel manager. I was also wondering if my exhaust is enough for that power and also if I need anything else once I get that high like a better head gasket or what. Thanks for all the input.