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I have a strong suspicion the new intake might have something to do with the problem, perhaps the diameter of the MAF tube is somehow smaller than stock.
I also had a problem with my boxster running rich.
It was very frustating and among other things I bought durametric, two new MAF sensors, replaced O2 sensors and checked fuel pressures.
In the end I read a forum post suggesting to check the mesh just before the MAF which seems to collect trash thanks to the bad design of stock air box.
I had small pieces of leafs stuck around the edge of said mesh impacting airflow, but not on front of the MAF so the readings were normal.
Your problem shouldn't be the same I had but disconnecting the MAF might help pinpoint the problem, even if it's not the MAF sensor itself.
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