I dont really no tbh, I guess your off to a good start with it being the RS 1800 130 bhp ? If you could squeeze 130/140 road wheel horse power that would be good. I think im right in saying that you can get the Forged pistons from the VW turbos to fit if you wanted more boost but this i think is where the aftermarket management would probably be needed. I personaly would'nt be bothered about running over 200 brake on the old BC gearbox tho.

hope this helps

Adder