Originally Posted by Rick0636
That sort of depends, a C&L maf does not require that, because it uses the stock MAS, or electronics, just a larger maf body.
Ha, I've have seen it go many ways. Sometimes they work they way they are intended, they lean the car out a little bit and make more power (from leaning the car out, not because they flow more air). I have seen them make cars run pig rich, and make cars run so lean that they can barely support combustion.
I say stay away from them unless you are pegging the stock maf or it becomes a restriction. HCI 4.2 probably needs an 80mm maf. Supercharged car running suck-through needs an 80 or 90mm maf.