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It's more than just an air restriction. For a check engine light to be on, you've failed some sort of airflow rationality diagnostic. If I were you, I would double and triple check for vacuum leaks somewhere in your intake plumbing. 99% of the time that's the cause.

Otherwise, reevaluate your design. If you have the MAF too close to the air filter, you may not be giving the air flow enough time to 'straighten out' before the MAF, causing inaccurate readings.
 
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