Panic you probably know more about this that I do.
Adding restrictors and rejetting to reduce the CFM.
Is this just smoke and mirrors or does it have some merit?
Attachments
600 to 400.jpg (40.16 KB, 77 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."