I just got a 03' 636 and was looking for some more performance. It currently has a yosh pipe and i pc3 is in the mail. I heard the next best thing is getting a sprocket kit, 1 down 2 up?? 2 down 1up?? i dont really know which one to get and dont really know much about that part of the bike as of yet. So i was wondering what you guys use and whats the best kit for the money.