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I was referring ti the insight.
Sticking a funnel on the front to act like a diffuser is going to be like breathing through a straw for a car. You can't just throw together an effective diffuser. Ideally you have to match the airflow through the engine with the effective increase in pressure to the flow entering the diffuser at the speed the diffuser is moving through the air. In practice you want it slightly larger than this.
I went through all the calculations for this on my car and found that my intake was almost the exact same size I calculated.
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