I just modified my existing mufflers and personall like the deeper and throatier tone. If you do a search on "exhaust modification" you should find quite a few posts on this mod. Sure beats 800$ for some of the other systems and is reverseable if you dont like it.
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Got a video so we can hear what they sound like?
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.