I just picked up a 2002 Mean Streak, 3,700 miles on it and she´s cherry. I put the Vance & Hines Longshots, and the Power Commander USB kit. Wow what a difference. But when I changed over to Red-Line synthetic oil (20-60) I started to get a small knock on my upper left side. I still want to have it checked out. Just in case. But it seems to go away after it warms up for a few miles. Where is your knock coming from ?