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Clean your MAF. Put your stock air box back on.
I would get engine running rich error codes on my old E90 328 when I had the AFE CAI on. I would clear the code and it would come back every 3-4 weeks. Eventually my O2 sensor failed, at the time the car was still under warranty so I put the stock box back in and took it to the dealer. Not sure if the O2 sensor failure was due to the CAI but just a heads up.
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