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I have a VaraRam on my Z06. I had long and detailed discusions with Pat Ledford of VaraRam - (866) 507-2648 - before I purchased and installed mine. Pat knows airflow. He strongly believes in area under the curve and strong torque numbers.
A VaraRam will not show all of it's potential on a Chassis dyno. It must have the air pressure created by your Corvette traveling 50+ mph down the highway to show all it can deliver.