Tbh my engine spec isnt really suited to a T4, a T38 would have been a better choice. The price i got my T4 for i couldnt turn it down. I am happy with it though. Talking to some people with T38's and GT30's mines on boost around the same as them if not before. I dont know if this is donw to bad specing od parts etc though.
I am not really that bothered about any more power for now. I just want to get the suspension sorted and set up with a few more add ons still to come.