The MAF transfer function and injector file is altered/inputed in the vehicles computer. It doesn't really have anything to do with the meter. Basically only purchase Ford Factory (OEM) meters, Cobra, Lightning etc. or SCT BA2400 or 2800 (I believe those are the part #'s) meters. These meters don't alter the resistance of the wire element in the MAF, which is the only reason Pro-M and those other MAF's made more HP is because they leaned out the A/F providing a false reading to the Vehicles computer. A MAF will typically not give any HP gains, even if larger in size...unless it is the point of restriction in an intake tract. It only extends the MAF range so you don't peg the meter. (i.e. in boosted applications)
Philip K.
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