MAC catback will sound great, I have that setup with an O/R Prochamber and am VERY happy with it - deep and throaty. I use to have an O/R H on my previous Mustang with Flowmaster 2 chambers (similar to the MAC Catback) and that had a lot of drone. This setup has no where near as much drone, you can listen to the radio, talk, etc.. with no problem.
Heres a quick VID I threw together for you to see, this was the day after I installed the midpipe. Excuse my driving in the first sequence, haha, 4.10's don't like first gear...
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