From the way it was signing off above 5000 on a stock engine compared to the stock plastic intake I doubt it will do better with higher RPM heads and cams without some serious internal mods. It looks like a street only intake for a near stock motor (which if so puts my Cougar in the intended market).
I am amazed at the spin factor in that article, you can see the plastic intake starting to better it with the upper data points, then the test stops quickly. The intake doesn't do what it was originally intended to do IMHO which also explains the 2 year wait, but it would work perfect for someone with a 5500 RPM limit on a near stock engine.
I would like to see it tested against a Bullitt intake, I imagine the Bullitt would give it a good spanking above 4000 or so which is where the racer needs it to work. I however want that 15~20 extra foot lbs below 4000 in my Cougar.