What has been the most popular fix for the stock exhaust droning issue. I already had the updated LBZ exhaust istalled from the dealer and it is still annoying. I took my Magnaflow off because I wanted to go back to the quietness of the factory exhaust. What can I do?

I ran the same as you did on my 04.5 LLY. I bought an MBRP muffler and welded it up instead of the Magnaflow. The MBRP was actually 8" longer than the Magnaflow muffler and the drone was nearly gone. It hink the added resonance certainly helped. I bought the muffler from a guy here for 50 bucks. Also there's resonators available which are basically all mini versions of mufflers.