hi. the problem that most people are having with boosting the tiburons is the fact that the piston rings are blowing. the pistons are literally crap, so anyone who has decided to up their boost are ending up having to get an entirely new set of pistons, or just going out of their way and splurging a few grand on forged ones before they even try to up the boost. as long as you fuel tune you can probably push 9, but i dont think i'd go much higher than that. i know of someone who had a turboed tib who ended up detonating and had to get a new car anyway. but with a built motor, there is a lot of possibility out there for the tiburons. i also know of someone who is twin turboing his car as we speak. as of right now, i think the fastest tib is pushing close to 400hp, but i could be wrong.