like Chip and others have said. You can only run the motor that came in the car. So you are stuck with the same motor as the MR2 (blue top) which doesn't have a chance in hell of making process hp. You can run a red top in a Geo prism GSI, but that woudl require you getting a different car.
BTW I would probably do anythign to get another 15 hp out of my blue top. I still wouldn't make process power, but atleast things would be better.