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The dip is clearly a tuning "feature" there to allow the engine to pass emissions. If you look at the Ecutek stock ignition and fuel maps you can see the ignition timing retarded and the fueling reduced.
This is not related to Helmholtz resonance because the ignition timing would advance with the reduction in fuel. It's pretty dumb and it's pretty obvious that it's in the tune. When the software for tuning is released I think you'll see some nice gains in that area... and further gains up top where the tune is altered to keep the catalysts happy.
Kind of tough to design a header around and engine that cannot be tuned. I promise the AVCS maps are just as funky as the stock ignition and fuel maps.
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