Ok. Just got back from a short ride sans helmet. Yes, I know it unsafe, but it was in the name of Science!. Anyway, I stayed in my neighborhood and just broke the speed limit -- I didn't take her on the freeway.
Yes, I hear the clicking. Not an alarming amount, but it's there...didn't sound abnormal though. It's as you describe. It's parked in front of me now, and its clicking like an 18th century morse code operator, but it's always done that. I don't think it's a problem. BTW, I'm still using stock pipes, but I plan to order the Vance and Hines 2 into 2 once they are competitively available. Hope this helps.