I think where we are no clear is the compsessor is no drag while doing the run, or yes, it would be a parasitic loss and cause it to run slower. We only have the compressor on when not at WOT, and even if you have a M6 manual, the delay before the compressor kicks back in when he ecm senses it is not at WOT for a moment is enough to shift fast, and w/the auto it's wide open all the way baby!
This will take some getting used to when first going to the strip, but is simple enough that most everything will work automaticaly.
