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Uh, just to clarify, there are no APE Stg.2 chips for an APE MAF kit. The Stg.2 chips are upgrade kits for the stock AFM only. All the AutoThority MAF kits have a specific chip mapped for that particular sensor. There are at least three that I've found and the mappings on those chips will only work on the exact MAF for which it was optimized. That is how APE is able to create a MAF kit that doesn't require a signal-massager of some sort to try and tweak the output signal to match the stock AFM.