exhaust drone/harmonic resonance

On the LX (new Charger, Magnum, etc) forums, a lot of people complain about drone, especially with the MDS on. A lot of us, myself included have found the Cherry Bomb Vortex mufflers drone very little to none and do not drone with the MDS on. They sound great, made my Magnum sound like a true Mopar. Those who don't like how loud they are add a pair of 12" glass packs. I think any chambered muffler is going to drone as there is no sound absorbing material.