i have a question about changing sprokets.i have noticed that the speedo is not driven off the front wheel anymore (04 1000) like all of my previous bikes have been.i see the "stunt /wheelie" sproket kits on ebay that say they lower final [email protected]%. is there a way to recalibrate the speedo? (power comander etc) do these type of controllers have that option ?or is it nessicery? has anyone used these sproket setups? how are they as far as quality? do they notice that much change in acceleration? thanks for any input..