I looked into ceramic bearings a while ago, not even that sure it will make much of a difference on the engine when you look at the cost.
But if money were no object, engine, gear and wheel bearings in ceramic would be cool especially if you did some back to back testing with a tach and gps speeds.
I think I seen someone advertise zero drag seals give .25 hp and 500 rpm- thats just a seal! Granted they are no good for dirt/dust but the allanache teflon ones are supposed to be OK (from the man himself)
So how many bearings does the car have?
gear carrier 5
Engine 2
Rear diff 3
Front diff 3
Center diff 3
Wheel hub 2 (x4 wheels) 8
So we have 24 bearings all up, even if it reduced drag enough to gain 0.1hp each thats 2.4 hp which doesn't seem realistic... Granted its drag to the wheels.. Even if we go 0.05 hp reduction from each bearing its still 1.2hp.
Im skeptical, motorcycle racers all over the world use ceramic wheel bearings (amongst others) and everyone swears by them, but the way I see it, any gains are negated by pad drag