Dave, Well...... weighed my 10-M5s last night and they are 47.6-8 grams. I have a gold spring and it is shifting @ 8300 now. I would like to try 9000 just to see what's going on up there. I"m looking for a blue or almond spring. I am also running silver 4th hole 34* straight. When i change that I don't think it will still rev the way it is now. I'm just trying to get a baseline out in the street before we get snow, and at the moment I am not very happy with the accelleration. Most of the Parts I already have are for bigger power setups than what I'm trying to tune in now.