Haven't gotten up with Daryll yet there Chris; I posted in your thread @ him after you mentioned it - haven't seen him on the boards lately.
After the FM tech said what he did about the OEM resonator, I reminded him that early Z had tighter resonator inlet than later Z; he just said, "Oh', and qualified his 'possibly', on putting it back, with no flow restriction put back.
He did say, as I knew, that the cooled gases had much less volume. He knows more exhaust tech than I do, so I couldn't debate it. And I'll LISTEN to anything, THEN judge...
But when he said C4's hatch geometry had more to do with drone / drone reduction, without pimpin' his hardware as absolute cure for the problem, I give him a little more credence.
So I'm still thinkin' on what to do here on it. More wrap in the meantime; harmonics HAS TO change with wrap, as opposed to strictly metal.
AND I'm wondering here, WRT to wrap on the last 2 20" sections, whether to wrap each individually, or wrap all the way around BOTH, together, or wrap in a figure 8, from the X-section to the diff joint split-off...
Did you get your OBX's on? And what do you have behind it? How's it sounding? And interior drone?