Grey blades are supposed to be slightly softer and does not break that easily as black which are harder - that's info that I got from Schumacher forum.
To belts - they are probably softer as well and cause less drag.
To parts numbers:
Grey Blades from SST: U1918
Grey front Belt from MI2EC: U3012
Grey rear Belt from MI2EC: U3013
I personally have MI4 built for a week and tested it only yesterday because of bad weather. Car ran nicely, but I found it bit too oversteering (track lacks good grip, was dusty and dirty after few days of raining however my 009 had much better grip with 6.5 motor), however it was nice to control in powerslide. I was racing against my friend that we are equal in regular races and I was still able to beat him.
Blades doesn't seem to be worn after about 10 packs with 10.5 motor.
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