I have had the Cobra's on my F6B for almost 5 years now and the so-called "drone" is really not bothersome for me as I never listen to the radio when riding...I can see where it might bother some folks at highway speeds...If tunes are your priority over pipes, I would suggest you leave them stock...I think the "drone" is kind of like the infamous "ghost shifting"...Some have an issue, most don't.....Regards and ride safe