the Mafia will allow you to go to 600 rwhp or so with that MAF.
An HPX or protube is not a terrible idea.
I have a buddy with a 3" protube on a 94 GT, and the MAF looks to be able to support up to 900-1000 rwhp before we'll need a Mafia.
Another Fox body with an 03 Cobra/T76 swap is using the hpx, and its at 745 rwhp and only getting to about 4V on the MAF with no Mafia.
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST