Or, flow doesn't mean as much as people think
Or, lights, heat, labor are higher because their skill set is higher....
Or, they know what your goal is, and a valve job will get you where you need...
I get people often asking for flow numbers. I throw an arbitrary number out there.. bottom line is, if you know what you are doing, cfm is a byproduct of proper sizing..
X amount of HP requires X amount of RPM... and the same X equals CSA.... CFM is a byproduct..
Why flow a head for $50 when I can do a VJ for $300.. hourly labor is required.. some are dirty, some need a valve job. Some need me to find a valve.. shop rate