My 06 came with Cobra mufflers and they made the bike sound like a loud Farrari on steroids. It gave me a head ace after 10 miles of riding it, and when a couple of Harley guys gave me a thumbs up, I knew it was time for the stock mufflers. They made the ride very annoying especially with the drone.
Perhaps the thumbs up was just a hello. Nothing to do with the sound.