UPDATE:
I removed everything electrical I've done to the car and the problem seems to have gone away. I won't know for certain until the car sits for a couple of days, but I'll update later. I went ahead and bought an alternator ($230+$20 S&H) for reassurance.
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2013 2SS M6 - Custom cam w/ miscellaneous valvetrain upgrades, ported heads, longtubes, CAI, CTS-VR lifters, Forza NPP exhaust controller - 500hp/460tq
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