I'm afraid I don't know them well enough to tell you. I do know that the '93 and newer ECM's are the ones to avoid. Ford made some drastic advance changes during shifting because of the pistons, and as a result, they have a noticeable lag right after each shift. But the difference between the A9S and the A9L is something I don't know. I kinda gotta figure there must be a reason the A9S hasn't been, or was only recently cracked.
Take care,
~Chris
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