If you want power then forget about the sc400, much easier to get what you need outta the 300. Probably the most desirable would be the 97 5spd, but 92s still look great and hold up very well. As said above, boostlogic has your answers as far as bolt ons, but you have a couple basic options. You can do 2jzna-T, 2jzgte, or 1jzgte. More info on those can probably be found in the performance sticky, on boostlogic site, or by searching this or similar forums. www.intellexual.net has oodles of information as well, read up and happy hunting.