I have full boost by 2700, all held very well at 1.9 bar till about 6500, near it's 7300 soft cut.
Mapping will make a world of difference, especially off boost, mine doesn't feel as quick but that is because it has no sudden increase, as there is not so much lost power low down now, as it has more so not such a step, onto full boost.
Mine is on greys and std cams but modded head, only light modding on exhaust ports.
I noticed when it was mapped, it has loads more advance now.
tabetha