I will agree that the stock F6B is pretty quiet, and refined. I purchased this bike after riding Harley Ultra's for 10 years. I added slip-ons to both Harley's, believing being heard is being seen. I don't have any evidence of such, but thought I might be less visible on my quiet F6B, so I started with Tri-Ovals, then migrated to Cobra 6-2-6. I'll admit I was a little concerned with what I perceived as a loud bike with the Cobra's. But, it's nothing compared to the fairly quiet Rinehart slip-ons on my last Harley. Drone? I think that's a matter of personal perception.