I tested a prototype R spec over the winter more or less back to back with the pro version on carpet. The difference was very small but did seem to be slightly less sharp and a little bit more forgiving due to the slightly increased chassis flex given by the plastic side rails which could well suit the majority of drivers. As I said though this was on carpet so the difference would be more noticeable. As for the shocks and diffs they are identical other than the boots. Bargain!
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