It look like the only t4 housing that atp supply is the 1.06,which was not available when i got my rear housing from them.
Though i think i will be happy with the response from .78...after all killer throttle response and a strong curve was more important to me than an overall number which is why i chose to go 2.2 litre with a twin scroll & individual throttle bodies.
I was going to try a borg warner as i have seen & heard good things from them,but i thought i would try the one i have first.