When I installed a TBE on my06 before I got it tuned it was a little jerky/boost creep after the verso tune from ASG it was fantastic, however if I really punched it out of a corner in 2nd it would cut out a lot. After installing a walbro 255 it stopped cutting out.

So from personal experience the 06-07 needs tuning with a TBE and to get maximum performance from a tune it needs a new fuel pump.