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i'd looked into itb's for a 911 project before, but first i'd heard that they make them for the m96 engines. first concern would be fit in the boxster. geometry aside, in searching around I found some cool info on alpha-n tuning - running the car without a maf (required with itb's) and just using tps. the bosche ecu can do it (that's how it runs in 'limp' mode') so it's just a matter of tweaking it for performance and accuracy (and fining a place for your iat sensor, and rigging a cable throttle that also has a tps sensor that speaks to the ecu). apparently chip wizards in the uk has experience with this. so, with tuning addressed you just need vacuum. there's a variety of electric vacuum pumps on the market, but uncertain if they can handle the crap that comes out of the aos (you want to keep vacuum on the crankcase to seal the rings); if so you can just vent it to a catch-can that you drain occasionally.
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