I am using a K&N drop in right now, and I have not had any problems with the MAF. I did use an AFE CAI for a few months, but on the 3.0i, it really did not make a difference compared to the K&N, so I sold it.

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Current: 2008 Infiniti G37 6mt
Retired: 2002 BMW X5 3.0i


BMW CCA member