Quote:
Originally Posted by EuroKar
Check engine lights that are stored for Mass Air Flow sensor codes that occur on both banks are in relation to a hole in the bottom of the intake air boxes. From my understanding from the factory some M5/M6's came with a hole in the bottom of the air box, that was a mistake and requires a block off plate. Its a simple fix and I hear has resolved all issues present.
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BMS suspects the hole was added to later models to improve airflow in to the factory airbox. Their flow testing showed the restriction being the primary air inlet and the extra hole/air horn raising that flow ceiling significantly. Blocking off the holes will restrict airflow and may lower higher RPM power levels. Bad idea in my opinion.
Mike