For anyone contemplating boost (now or future), and getting an EFI that includes transmission controls: try to get one with an input to retard spark on shift. I'm stuck with the Toyota factory (original turbo transmission) shift retard, need to go aftermarket to increase it, but it helps.
I have a gut feeling that some spectacular mid-track events are (partially) the result of a bad chassis reaction to a shift ("it launches straight, but makes a hard left 3 seconds out"). Being able to drop 200 hp for .25 seconds, at exactly and only the point that makes the suspension crazy may save it.