Mr. 5,
First off: Very good work!
Honestly, I was not surprised at all with your results. Coming from the VW/AUDI scene, I can share some experience with the experiments we did back then and people posted in the VAG community.
As stated in another thread here, for me, the BEST intake is the one intake that provides optimal filtering capabilities and also providing maximum air flow over the widest powerband. It has been determined that the most successful intake would be to have a smoothed, gutted and polished airbox and a quality OEM paper filter.
Its seems to me that with your intake, you are going one step further, by supplying additional clean air from a second source.
P.S.:
That Dinan intake, might not be so bad after all
...rather expensive though!