Can you see perhaps how an 11 second nitrous 318 might want a different intake than a naturally aspirated one? N/A car is going to probably want 6500+ RPM, whereas a nitrous car might turn 1000 RPM less.
The differences between an Air Gap and a Pro Products intake are going to be significantly smaller on a 13 second NA combo, than an 11 second one. Further, there's probably no 13 second combo that would want a single plane M1 intake instead of a dual plane due to the cost in low end torque with the single plane.
And if it was the dual plane M1 he switched from and made more power, who cares? The m1 dual is not difficult to beat, even with jacked up Chinese runners.
LOADS of cars run 13s with the stock iron four barrel intakes, so they're then potentially as good as the Crosswind I suppose.
I would love to see a comparison too, but I'm pretty certain what the outcome is going to be.
Do you suppose that the tolerances in construction are so varied that the Pro Products could go from making significantly less power to significantly more power than the Air Gap just based on casting variances? What would that say about them?
Post up some pics of yours. I would love to see them.
Steve