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G'day, I had a vibration noise at 2500 also, Turned out that one of the small bolts holding the inter cooler on top of the engine had rattled out, allowing the vibration. Was a easy fix Doesn't sound like this is your problem but thought I would post it here for anyone doing searches in the...

The small hole is so you don't trigger a engine light due to no air flow, d22's however don't have a sensor for the airflow(good on you Nissan) so no hole is required.