You can get a lot of power from the stock Hitachi turbos (the SCC RX-7 has about 360+ at the wheels). Two properly tuned turbos work better than one improperly matched. If you want a single turbo setup, consider how much power you want to make, driveability, and reliability. I can't make any suggestions; it is up to you to properly size the right turbo. I see people making suggestions for T04's and whatnot. Why? Is it because it ultimately crams tons of air at some arbitrary high rpm, say 5000? That is not to say that a T04'x' is the right one for you. A turbo like the T04R or 'S' or 'happy face' will work properly if you can tune your engine to do so. Remember that you have a ECM. Use it :).

I thinks Re Ememija uses the Gweddy TD06 for track use good response and gives you 380 ish pony powas and much cheaper kit tooo's ehehh good luck