Yes that is the case as well here... I have a prefacelift C230K AMG ... and i recently got a rebuild facelift C230K... the rebuild C230k is running now.. and has a whole lot more power than my prefacelift... very noticeable power.. which shouldn't be the case i feel.. so i wanted to swop around some components to test but because the ECU's are different i wondering what the limits on that is..