Just looking over the settings that is not possible. There may be a hack that allows for that and I'll look over the next few days. Otherwise the only solution would be to rename the forums. Instead of "Cooper S" the change would be on the order of "Cooper S :: 2nd Gen" and "Cooper S :: 1st Gen"
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What if in the first gens they were changed to R50 and R53, I know the Cabrios would be a grey area but it would be pretty clear then what's being talked about.