Is the reliability on these things still iffy? If I had my hands on a turbo model, I'd have a field day on it
for 07+ it's a brand new engine so it's hard to say. stock boost levels are around 12psi. with the jcw stage 1 kit going up to 14.5-15.5psi.
however, there are some crazy tuners testing a GT25 turbo going as high as 19psi but no one is saying how much power it's making but estimated well over 250hp.