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I have driven neither, but have spent a long time in the turbo world so here is my interpretation of the data....
Roots style setup will give you more immediate power delivery. The curve starts early, but doesn't build continuously in the same fashion as a centrifugal setup. A centri can flow a lot more by design, but takes time to build. The curve starts low and then ramps up, so the car should have the sensation of ever increasing power, because it is. It will peak later, and carry the torque later through the rev range.
You can get the same effect in the turbo world with changing turbo sizing and geometry. A small compressor will tend to spool quickly and deliver early boost and then taper off as the revs build. It simply can't flow enough to maintain the pressure and you see the torque fall off as a result. This is pretty much every 4cyl turbo car you see on the road, aside from the sport ones like the Focus ST/Subaru STI/Focus RS/VW GTI. All of those guys have a smaller turbo cousin for the masses that makes pleasing immediate power and the trans short shifts its way through 8 gears to make MPGs and stay in that narrow power band. The sportier ones get a bigger compressor and can build more boost and hold it longer giving more power and area under the curve.
I don't know if I would be too worried about the filter sitting over the headers. Its gonna suck in a ton of air, that will get a lot hotter while being compressed. The trick is to have an efficient IC setup that is big enough to get the IAT down low enough that you can get some more timing advance.
I need a beer....
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