Our track is a 10-12 sec lap carpet and most run 2WD but the two fastest 4WD have been B44.3 with slipper replacing the centre diff and Kyosho ZX6. Then again they are very fast drivers and we don't have enough 4WD drivers for a big competition. The Kyosho does seem to break a bit more but he does drive it very hard and the track is in a sports hall and the walls can be unforgiving ;-)
My son drives the B44.3 occasionally there and likes driving on carpet with it, he prefers to keep the centre diff. The B44.3 can also run shortie or saddle (saddles best) and is an easy car to drive as well.
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