Are you doing a single or twin turbo?
If you are going single turbo are you going from 3" down pipe and y-ing off to dual exhaust?
I am running flomaster 10 series race mufflers on my turbo stang. If I were you whatever you do, go with a muffler that is a straight through design and doesn't have any chambers or baffles so you don't have any major backpressure on the turbo, you could also run mufflers but run a 3" cutout before you y the single to duals and uncap it whenever you go to the track.
Or since the turbo acts as a big muffler and you really want it to sound mean and like a major beast just run straight downpipe!