the stock radiator is HUGE, its WAY bigger than any other stock rotary car's radiator. the cooling "problem" might need a different solution, like a colder thermostat, or ducting or something.
i say "problem" because the rotary actually gets better mileage, and lower emissions when its hotter. so just because mazda has it running a little warmer doesn't really mean its bad.
there is less margin though if something goes wrong
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