hello mate
i have one
see my spec and dyno sheet here,
https://passionford.com/forum/viewtopic.php?t=92375
made the power, 505bhp, 447lb/ft on 31psi peak and 26 held on ies engine dyno.
was less laggy than t4, but not as quick as was told.
but mine is on a full 500bhp spec head and cams, and a faulty actuater.
it will be fully mapped in the next few weeks, and boost controll sorted, and i exspect full boost around 3.5 k rpm, of 30 psi.
wen last in car in november just after dyno it held over 30psi at 7.8k rpm in top gear.
and power dont peak at all.
other peeps on here have had surge problems, where turbo is producin to much boost (at low revs 2-3.5 k rpm,) and engine stuters, but i believe thats because they were usin either a std engine spec, or only mild head and cams.
daz C dad used to have one on his cossie, and had surge problems, so pm daz.
cheers danny