I can hear mine also, even with debaffled oem pipes. But, it's not loud at all. Kind of a whirrrrring. In fact, when it first kicked in this spring, Kinda freaked because I hadn't heard it before. My ears are getting tuned to the different sounds the bike makes. Now, I look forward to hearing it since it has gotten hotter out. I think I would be more concerned if I didn't here it.