I have exactly the same set up, cat back non res ed30, with Superchips stage 1.
What i would say is, at 3000rpm in top gear, if the exhaust is new, there will be a boomy noise from the exhaust, but over 1000 miles or so, it will quieten down, but agree makes a great sound.
If you go downpipe and sportscat, then id recommend going to Resonated.