This link has some interesting information with wiring diagrams that seem to get to the bottom of it.Not false...
Sooo.... let me ask again..... do the 5pin newer plastic maf have an IAT in them? If not, what is the additional 2 pins for.....
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http://ls1tech.com/forums/conversions-hybrids/674487-3-wire-maf-5-wire-maf-conversion-diagram.html