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Which CAN bus, chassis or powertrain?
If you're going to the EVIC, I would assume it's on an interior / chassis bus. The 83.333K fault tolerant bus was standard fair for Daimler and VW in the early 2000s but I don't recall what Porsche was using back in those days. They might have been using a 125K. Either way, it's also a fair assumption that the network was using standard 11 bit message IDs.
As far as powertrain, 500K is a pretty safe bet.
If you need to know for sure before hooking anything up, GridConnect.com sells a CAN bus to USB adapter for $399. Unless you have a friend with a Vector CAN Case setup they can let you use for free, this is the least expensive way to sniff the CAN bus.
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