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Your post makes sense. Only thing is, what you're talking about usually refers to the intake manifold after the throttle body...not the intake before. For example, BMW tightened up the intake runners for '96 and on E36 M3's to achieve more torque down low. This sacrificed some top end power vs. the '95 M3 which had slightly larger runners. Plenty of owners have swapped intake manifolds and dynos do show this.
Throw the stock box back in and dyno. If you regain your power and the a/f is good, there's no need for a GIAC.
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