I'm curious what kind of power EFI-NA cars can make when tuned well.

I'm especially curious if someone has modded their car, been on a dyno or down the 1/4 a few times, then still running NA has tuned it with a standalone and done the same.

HYPOTHETICAL: ;-) If you had NO air flow meter and had a replacement for that ;-) ;-) how much power would a NA car pick up?

1.6l miatas in BONE STOCK form can pick up 4-5 RWHP by just swapping from their flapper AFM to a stock 2nd gen AFM. Amazing....

Thanks in advance!