You can tune it as much as any of the others to the best of my knowledge, mine is up well over 200bhp now but it has cost a fortune in mods, turbo, injectors, custom exhaust, pd160 intake, SS front mount etc etc. Then you need the brakes to stop it so ive got rear disk upgrade and 312mm fronts.
I dont know the price of the SS intercooler as it isnt one of the mods ive done.