nah, you dont have to be forged to run any turbo as such, just depends how much boost you're planning on running.
Urm just thought, that wasnt really a final power run as he was still tuning it, he ran it and got 191bhp and then said he'd go for a final run, tweaked around and came out with 215bhp, so i dont know if the sudden increase in bhp was when he "tweaked" it??