The ls motor is by far the best choice for what you have. You really dont need to do all of the things crxsi91 said to go turbo though. All you really have to do is: low comp. pistons, turbo cams, a better ecu(uberdata is the cheapest one to use) or if you have the funds, a hondata s200, a decent turbo setup(custom is almost always best), some tuning, a better fuel pump, some injectors, some bigger exhaust piping, and your basically set. If I missed something somebody please fill in the blanks.