I'm going to agree with this guy, I may not be a Focus expert by any means but I have been building turbo engines for quite along time on other platforms. With my other car the T3/T4 hybrid turbos are common place compared to the general T3 family turbos. Although T3's are used alot on street cars for quick spool set-ups.Im running a T3/T04b, 48 trim. I put down 180hp/190tq at 6psi and 210/220 at 9psi. That was with the stock cams and all that jazz.
It does not react like an 82 trim T3/T04e. There are alot of different trims, a/f's, housings, ect. Its a broad statement to say all T3/T4's are too big for a Focus.