Look in the motors modification, it is said that any engine serves while you have space to put it, but if the MR2 is not common, it tries to get one of celica or for a walk those mottoos are mounted in front and not behind like that of MR2, usually the motor purchases and box all together, if you do not find them very fast, you can fix the cylinder head so that they run a lot, that is simpler than the turvo. Veils can be done, but remember that you also have to stop it and on occasions you have to make some small arrangements to the brake system, they are not Mchos, well look for engines tell us which one you want or which one you got and we will there to take a good discourse, abrases and take care.