I've never been a fan of flowmasters...you are probably referring to the resonance that is inside your car.

If you simply want to eliminate the "drone" but keep it loud on the outside, check out some of the flowtech offerings...Extremely under-rated mufflers imo

Likewise, you might be happy with the simple Dynomax Super Turbo...If you really want to keep the flow going look into their UltraFlo line...

Check the mfg sites for clips (should have idle, drive-by, and in car)...Find one you like and then check back here to see if a member has them on their Mopar.

Also what is your engine combo...headers...pipe size...exit location etc? All of these might influence your decision.

Hope that helps a little...