No, the way Bill programs his whisper mode, it cuts start of injection advance by a certain number of degrees across the board, all the time.
I wouldn't say it is detrimental to engine longevity if you do start and run it while cold. I would try to avoid doing it though.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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