I think you might struggle with a journal bearing T25 turbo to get more then about 220-230bhp. They are generally out of their efficiency range past about 200bhp. But again, if you try it, you can get set up, see what it makes, and swap it out for a T28 or GT28, as the flange is the same, so if you get a 5 bolt dowwnpipe flange on it, you will be able to just swap it out. After their efficiency range, they start to blow hot air, so you can end up loosing a bit of power, and restricting flow. Mine is a T25 on my green puma, and a large T25, and the diffrerence between 12 psi and 14psi of boost is nothing, i got my best 1/4 mile time at only 10psi.