I would strongly recommend a bypass / blow-off valve. I'm really surprised the kit didn't come with one. Think about what happens if you're at 5500 and then jump off the throttle. That throttle blade shuts so darn quick and your blower impeller is still spinning very fast. Not a good situation.
As for the metering issue....well, when I setup my ProCharger, it will definitely be a 'blow-thru' meter from Pro-M, probably the new Univer meter they have. A MAF after the blower will provide better idle, and will increase the overall driveability of the car. This is info is straight from the guys at LaRocca's - supercharger experts. Just passing along what I've been told.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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