Flowmaster 40 interior resonance and B-quiet

[xmitsu10]

Last spring I installed a pair of Flowmaster Delta 40's and am happy with the exterior sound, but not the interior resonance at 2200 rpm. Since they are new, I'd like to keep them and was wondering how much resonance reduction I would get from installing B-Quiet Ultimate or Dynamat inside the cab (floor/doors/rear wall). Would love to hear anybody's experience with a similar situation before I break down and replace the mufflers.

Mark