I do not run a turbo, but I can tell you right now that you will not enjoy dumps all the time. I have cutouts installed on my O/R X pipe and believe me, running open headers is very loud.
I recommend having someone install some QTP Electric cutouts in your exhaust system. That way, you can press a button and have no restriction on the fly. You can also run a normal catback around town if your neighbors don't want to hear all 8 cylinders screaming HELLOOOOO!!