People seem to underestimate the GT30.

I'm running a GT30 hybrid core in a standard bolt on fit (yes you heard lol) housing on my Sccob currently. 1bar at 2700-2800rpm, full boost (1.5bar) at 3000rpm. 480bhp @ Fly at only 1.38bar boost (was on a hub dyno the other day and got 395 ATW) due to not having a strong enough actuator. This core will run 2bar all day, go figure what it would be capable of at this boost level (it made just under 400bhp at 1bar).

I am about to bang a different core in (but still a GT30 hybrid) and wind the boost up. The aim is to have the same response as present and make about 550bhp on pump fuel...... this will still be using a GT30 type core.

Plenty of life in a quick response GT30 Hybrid turbo me thinks.