Flyin' Miata 1 800 FLY MX5s
btw , evey mod , tested there , no bull.
dyno run base line.
change
repeat dyno run, same atmospherics (pressure and temps) ,sameday.
not perfect science but , if you can get numbers greater than the natural errors in a dyno (etc) then pop eyes out.
many AIR mods are best wth a TURBO motor. (synergy)
the above test is near impossble with a fan. needs track tests.