UPDATE: it took some time but I finally got rid of the drone/resonance in the exhaust system. It was as simple as adding a J pipe. My exhaust guy had custom made a 29 5/8" J pipe and tapped into the exhaust about 6" behind the muffler. He curved it slightly up and forward and then reverse curved it up over the exhaust pipe and towards the rear axle. He built a slip joint to tune 2" forward or 2" rearward from the 29 5/8" starting point. The 29 5/8" starting point worked great after the test drive so he tack welded (he welds everything, doesn't like depending only on clamps)the band clamp he used at the joint. The only drone I hear now is now very slight (is more the load on the engine and only when there is a load on the engine, not when cruising at steady speed) with the Magnaflow muffler, much quieter and sounding more like the flow through muffler that it is and not drone. Very quiet at cruise and did the trick. No need to wrap this or bullet that, J pipe was the way to go.