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Hi Greg-When I do a tune I put the car is SD and tune the VE table with a wideband-then enable the MAF and do the same. In order to pass an E-test I make a few changes to the idle parameters, and fan turn-on points-but this doesn't affect WOT at all. If I tune a car I will do an E-test tune for whenever you need it at no charge and then put the back the tune to way it was before.