I had blackouts as well, until I got fed up with almost getting rear ended all the time.
I ended up going the VHT route as well, just with one light coat though instead of keeping it dark like the darkouts.
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95 Z28 M6, 383, D1SC, FMIC, ect., ect., 614 RWHP with the stock PCM and pump gas!
98 Formula WS6 M6