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9 In an effort to correlate the vacuum losses with the airflow, boost, and power gains, Kenne Bell tested not only throttle bodies, but complete air intake systems on its SuperFlow 1200 airflow bench. As you might expect, there is a direct correlation between the airflow and power gains. Less vacuum in the inlet system equals more boost out of the blower, and ultimately, more power from the motor. Sometimes less really is more.