You could always upgrade the engine's internals such as, Cams, cam shafts, cam gears, Pistons , etc... more or less build up on the stock motor to handle a higher boost ratio. And 9/10 if you swap motors and try to assemble the old turbo to it. You may or may not have to change parts depending on how identicle the motor is.
Just find a 2zz motor online and compare it to the one in your car now. You will see what all you have to change in order to get the turbo kit to work on it.