My 2015 drone was even worse than you describe. I was ready to sell the bike after the first 4K miles. I removed the stock black exhaust and installed a chrome set of mufflers from a 2014 that I had the opportunity to purchase (heat shield and tips included for $200 total). Wha-Lah . . . drone completely gone! ! ! I still have the bike now with 40K miles and it's the best bike I've ever owned - but you're correct, the drone with the stock exhaust was horrible. I know that many members on this forum haven't experienced what we're talking about but believe me it really exists on some bikes.