If I am not mistaken, the A9L is only calibrated for 19# injectors and is used for the manual trans GT, so I would say keep your X3Z computer calibrated for 24# injectors and would also advise against installing a chip, those are really only for unmodified vehicles and only alter WOT calibrations. I would suggest, for complete control throughout the power curve, investing in a SpeedBrain. (
www.speedbrain.com)
