Same thing with my BBK fenderwell kit. Sounds like a 'sucking' noise as you open up the throttle. Mine is most noticible between low rpms and the initial 'hit' of the throttle. I think the sound is kind of cool.
I think what you're hearing is normal.
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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