Just purchased a new 2012 tri-glide. I had the pipes changed and dyno tuned. I had only rode the trike about 100 miles before I had this done and did not notice any engine chatter before the pipes were changed and it was dyno. I am now hearing a chatter when I throttle down at speeds of 60-75 mph in 5th or 6th gear and especially 6th. It is loud enough that my wife also hears the chatter. It sounds kinda like a loose screw or something vibrating. Has anyone had this problem or can anyone tell me whether they think having it dyno could cause this problem or is it a problem? Thanks!