Unless PTE is casting their own hotside, my understanding is that garrett doesn't make a T4 hotside for the GT30, and frankly a .48 T3 would be way too small for that turbo /ubbthreads/images/graemlins/dunno.gif
There are a bunch of new garrett divided t3 hotsides that are coming available for the GT30 though, and twin scroll = win. I'd go to a .8x divided before a .63 open any day of the week.