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1. i *think* you should be able to take the vacuum signal that drives the resonance flap on your intake and use it. if you look at your intake there are two tubes that join the two sides together - the diverter 't' and the resonance tube. on the resonance tube there is a vacuum-driven flapper valve. 't' off this vacuum signal to drive the flapper on your diverter.
2. personally, i would just connect the new diverter/throttle body to your existing airbox/maf housing to start. this way your car can work with it's original tune and you can see if you get any performance improvements, if the flapper in your diverter is working, etc.
3. if you do go to the cayman airbox, you can saw-off the maf housing on your original airbox and plumb it into the system, or you can use the cayman maf housing and see if your ecu will adapt, or you can push a 996 tune onto your car (designed for the larger maf housing). only the first is certain to work; i've not heard with any certainty that the other two will work.
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