I don't have a direct answer for you, but I do have some thoughts:
*Outlet area should roughly equal inlet area. If you know that value, it would probably make a decent baseline.
*You are thinking of chopping up a kind of expensive part of your car. Perhaps a junkyard hood could be obtained for your testing phase, then transferred to your "good" hood when you achieve satisfactory results.
*Or, make your own temporary hood out of coroplast or something and use tape and/or coroplast pieces to optimize the size and location of the outlet.
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