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      11-28-2012, 08:47 AM   #7
Wrngway's Avatar
Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

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Isn't the oil pump also electrically driven?

I'd stay away from under driving the alternator. Any gain in power would likely be minimal at best. Even on older 4th Gen Camaro's with LT1 V8's the underdrive pulley would only net about 2 hp.
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