As Dyna mentioned, at Caldi we've done a motor limit, but also control tyre of Schumacher minispikes (or Schumacher blocks if 2.2" wheels aren't available) and that seems to have helped.
ReRe cars are allowed but there doesn't seem to be a performance advantage with modern parts.
Other than the 4wd making the 2wds lives a bit harder as we mix classes!
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