Drone is the loud resonance you have to physically yell over (or turn up radio volume) while cruising at a constant speed/RPM - typically highway speeds
Years back, I threw some Magnaflow dual-in dual-out custom mufflers on a CTS coupe with a LFX and it sounded terrific on throttle, but was unbearable at highway speeds. I kept it anyways, but highway trips over 45 minutes were a direct request for a migraine. This is my only apprehension in custom solutions on the 4BW -- similar v6 note might drone in a similar way/RPM range