Do you have any experience with changing the front or rear sprockets from stock 17/47?? I've been told that you can't go up to an 18 on the front and White Brothers only have a 43 or 45 tooth rear sproket. If so... What changes in performance did you experience.. I'm looking for better traveling gas mileage, but I don't want to loose the edge I have when running with 1100 BMWs.. "Douglas L. McLeod"