I am looking for a stronger turbo than my T3 on my Cossie 4x4 stage 3 and got lots of questions like

What boost can it run at. Does it reduce lag.Are there any fitting problems. Seems to be a flat 4 bolt flange where the exhaust downpipe fits instead of 3 studs and cone fitting, is there an adaptor. What do you think of it generally, any down side to it all.

They sell here brand new at $1330 about GBP700

Thanks