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The black box can store any number of different tunes which you tailor yourself at a PC away from the car.
LS1Edit tune here
Gave my brother back his Hypertech junk. The Best V8 Stories One Small Block at Time
You can still get into trouble with the handhelds (e.g. what if you commanded too much WOT timing and your WOT AFR was too lean...?).
The software ones let you use a wideband to see what is really going on (it provides log data to help you "self-tune" various tables pretty quickly).








