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The Eurocars efficient dynamics system should make a difference, IIUC the USA spec cars don't have it. The system disconnects the alternator when the throttle is open and reconnects on closed throttle/braking, subject to the battery having sufficient charge. I guess the effect is something similar to the underdrive pully but more so. I've read it could be worth a significant number of BHP at high rpm WOT but can't find a source.
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