MAFs-
The stock F-body MAF can easily handle 400rwhp without being a restriction. Pull the screen for 420-460rwhp which can gain 5hp.
A good upgrade is a GM 85mm MAF with screen. These can handle 500rwhp with no restriction. Over that you should be looking at Speed density anyways.
From a tuner's point
MAF's with screens are the best to tune. The screen straightens the airflow to make the MAF curve linier and easy to tune in at speeds/idle.
ported or the famous maf ends can be the biggest bitch to tune in right since the airflow is all over the place at different speeds. The fuel trims will vary by load/speed/idle. Can be tuned in to work OK but the difference can be felt at transitions which can be spotty.
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