From what ive gathered, the basic changes are the move back to passive differntials (as previously mentioned) as well as the lack of water cooling in part of the engine.
Im not quite exactly sure what part of the cooling system is being changed, but I assume there is no performance cut (appart from the slight possibility of having to detune the cars slightly as there is no longer that extra cooling ability).
Going by the '06 Focus' performance in Rally Autralia, there isnt a notable performance differance, but the cars did seem more sideways (which is visually appealing).
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