There have been a few discussions about ECU whine, such as in this thread:
Had FIXED HIGH PITCH NOISE (ECU) I hear it to. I'm pretty sure my aftermarket exhaust will drown it out once installed.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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