T25 will give instant response, and good boost up to about 12-14 psi, then you will run off the map and make just heat. You will probably get away with 550cc injectors at that level.

If you want to run high boost(25-30) you are going to need a bigger turbo, like a 16g or 20g, but I doubt our block will take it.

Are you allowed to mount the radiator where the rear seat was, and duct the heat out the back? It would simplify the intercooler install, and make the radiator invoulnerable to rocks.

John C.