Data I have on misc 998 ECUs (from my own notes) is:
96506801B = stock ECU for 996R/998S
96507502B = ECU for 996R/998S open / race 50mm Termis
96507402B = ECU for open / race 45mm Termis. Note the change of digit from 5 to 4: basically the variable around whether it’s for 45mm [stock] or 50mm [S] cans.
96507602B = Note that variable ‘6’ = ECU for 998R open / race cans
96507702B = hmm, dunno, ECU for 45mm to 50mm system?
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