Just by looking at your sig, I would say that the stock meter will choke you pretty good. Why not go with a Pro-M meter? They have their new Univer meter that measures air in a 360* radius, as opposed to the old sampling tube method. The Univer helps to cure surging idles associated with CAIs that 'bend' the air, thus screwing up the sampling parameters.
Also, why not upgrade to 24#ers and get the meter to match?
IMO, Pro-M is the way to go.
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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