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Am I wrong? You have it, I don't.
It is my understanding that there is a seperate box that ties into the ECU and the MAF, etc... Being a seperate box, I call that a piggyback, rather than a fully reprogrammed ECU..
Both ESS and AA don't use external boxes, they reprogram the existing computer. (from what I understand)
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'01 330i with some Dinan stuff
'04 C320 4-matic Sportwagon
'99 K1200LT
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