Well if u r trying to reach those number u r going to need more then just a turbo. It doesn't matter if u get a 1jz or 2jz, u will need to have upgraded your computer, fuel system and turbo and exhaust. Also if u r trying to hit over 600whp then it will depend on what u r trying to go for as in drift or drag. For u to hit 600whp at most then that turbo should be fine. Also for what the last guy said u r able to use most of the parts of the 2jz onto your 1jz, most of the parts are interchangable. Idk what he's talking about. The problems that u run into it's pretty much all going to be the same... U will just be paying more for the 2jz engine instead of the 1jz.