This experience may help...
My car is a 2000 Box S. I replaced the original MAF (996.606.124.00) with the updated MAF (996.606.125.01) and took it to a shop to have the software updated to use the new MAF. When I had the car dynoed, I had a part-throttle lean condition. Things were OK at WOT. I put a 124 MAF back in and everything was fine. It turns out that the shop had not been able to update my software.
Maybe you've got the 125.01 running with the old software.
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Rennzenn
Jfro@rennzenn.com
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