Hello DafTekno, when I bought my '06 Magnum RT, it had a SLP Loudmouth catback exhaust system installed. I was not happy with it, not so much for the exhaust volume, but the awful drone! I initially installed some Vibrant resonators, which didn't seem to help the drone at all. I then removed the SLP bullet-style mufflers, and installed a set of Magnaflows. It was better, but still pounded my head on the highway, especially when the MDS kicked in. I did a bunch of research, and settled on a catback system made by Solo Performance. It has a large single can muffler (with two inlets, and two outlets), as well as a set of "J-tube" resonators. The J-tubes are based on the Helmholtz resonance technology (https://en.wikipedia.org/wiki/Helmholtz_resonance
) which takes a closed end tube, sized (diameter and length) to absorb a 1/4 soundwave (at the drone resonance frequency) and reflect it back into the exhaust to effectively "cancel" the sound pulse which causes the drone. Probably more explanation than you needed/wanted, but the bottom line is it worked for me, essentially eliminating the drone completely. That being said, the system still has a nice (not obnoxious) burble at idle, and definitely speaks up when you press the loud pedal.