Holy smokes that's a gas guzzler! I wish I had time on my hands to do a project like that. It's ironic that I work at an automotive testing center - https://natc-ht.com , but don't upgrade my vehicles.
The issue is the quality of the airflow, not so much the volume or pressure. Fast moving, turbulent airflow from a scoop is worse than pulling from a high-pressure or static pressure duct.