seen boy's make 330 on 1.6bar, and 350 on a 2871 at same boost, good turbo's and come in with a bang on a 4e
mine was running at about 1.6bar no probs at 330..
yer 3" and yes it had fast road cams.
Gt series turbo's are strong! Any body who says "oh there ball bearing and don't like big boost" dose not know what there talking about, you can run the gt28rs at 2 bar no proplem, For example the cosworth lads all run masive boost, and the GT28 30 35 and even the 40 and very popular turbo's and built to last.
i built a starlet for a customer a few months ago got it mapped to run it in. its spec was a forged 5e ported/polished head hrf inner shim kit and cruise cams with a gt28rs topmounted zisco kit and it made 250bhp @ 0.6 bar
also had a std manifold
we recon she will easy see 350-400 @ 1.8-2.0 bar with a few more tweeks