My club's mod 4wd class is mostly made up of XX-4s (and a XXX-4) and Cat 3000s but the fastest is a Yokomo YZ-10, driven by the owner of my LHS. He has won more than 5 championships and is leading the current one. It just shows that if you drive well you can win even with old equipment.
(he's done the same thing with a TRX-1 in 2wd)
