Originally Posted by WingmanSR20 
one thing to remember (at least how i was taught) is the MAF is measured based on the difference between the positive voltage and the ground wire voltage. Therefore, you want the MAF's ground to be as consistent with the ECU's as possible.
For example, the ECU ground might actually be -11.2V, so if you ground the MAF directly to the battery negative (-12v), you could be off by that much (0.8V), possibly more. However, if you ground the MAF to the same spot as the ECU so it too has a -11.2V ground, then it's more accurate.
Those connections on top of the intake manifold help you accomplish that.
If I'm wrong, though, please someone correct me.
That makes sense, I'll try that later today. Thanks.
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