That intake shootout is bullshit. OF COURSE a dual plane is better than a single plane.... everywhere...on a MILDLY cammed application that's not making power past 6000. I'm not saying the numbers were wrong, altered, and I'm not saying that the guys performing the tests were being dishonest. All this did in my opinion was illustrate what a poor combination of parts does.
I bet that a properly set up m1 single plane will outperform a properly set up air gap on an engine exceeding 6,000 RPM.