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To put the turbo question in a simple way, the only major difference is as the air enters through the air filter, it then proceeds through the turbo where it is compressed, and then into the intake manifold. All of the air that goes into the intake manifold comes through the turbo.
As for your CIS question, it is my understanding that the programing required to map a car is big bucks, and Porsche didn't feel the need to spend the money on the small production turbo. Not sure if that is the reason, but this is what I have heard in the past.
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