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More air, does burn more gas, however this isn't always good.. The power we are getting is the ecm getting a signal from the MAF (if equipped), and running a slightly leaner mixture, now, the air restriction is further down the line. The intake tubing is only so little of the system, the throttle body, then intake manifold, and last the head's valve ports are where it really matters. The small 5hp gains we see is the computer compensating and running lean because the airflow messes with the MAF, on the other hand however... A cold air intake+custom tune(to adjust for higher flow and maintain the proper AFR) will be most beneficial.