Really depends on your taste for the volume. I went with the 18" because I didnt want it too loud, also went with HFC's non resonated. I went with the HFC's because I want to pass emissions when needed without having to switch cats back.... As far as the volume goes, when I first got it installed, I thought it sounded excellent and almost too loud for my taste, after a hundred miles or so it settles down a little and now I think its perfect. Somewhat quiet/tame when driving normal and roars when WOT... Its a tough call to make unless you can actually be in a car that has the different options available.
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