[TurboRay]

The original link shows 0.7mm (not 0.07mm).......

You're right in pointing out that that's a huge disparity, crono! I don't speak German, so it didn't really resonate that the "0,7"mm shown on that site meant ".7"mm , so ~ instead ~ I just went with Matt's figure of .07mm......oh WELLLL, lol! 

BUT......in spite of the fact that some of the area figures I presented were wrong (I blame the narcotic pain relievers I've been using to compensate for major back surgery I had nearly two weeks ago) ~ you seemed to imply that your flow-percentage comparisons of the 2mm vs 1.6mm restrictions were based on hole diameter  rather than hole area,  crono. Oddly enough, however, "MY" area-percentage comparos remain approx the same as "YOUR" diameter-percentage comparos ~ so, perhaps I misunderstood the basis' for your comparisons?

In re-doing the math, the 1.6mm-diameter restriction is NOT 80% as I originally calculated, but rather about 64% the size of the OEM 2mm restriction.......the same figure you came up with. AND.....the .7mm diameter restrictor ALSO comes out the same as your calcs at approx 12% the area of the 2mm restriction.