FYI- dropped the Demon off with 502 miles, dealer installed all the race stuff (for a fee), now to deal with the summer tire fiasco. I think the rear street tires (Michelin Pilots, 345/30/20) got flat spots for sitting in the same place for too long. This is my fault, just had tires in the past that never had this problem. Phasthemi, recommending doing a burnout to get rid of the flat spots, a nasty burn out was partially effective at greatly reducing the vibration that occurs around 70 MPH.