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you can purchase a cable from durametric then download the software for your laptop at their sore, it'll do just about everything the factory pwis can do, except program keys and such.......its a great tool for the enthusiast who can't pay 10k for the pwis........
it'll let you rest codes, diag the car properly with its live data and activations etc........been using out for years at the shop.....
shot me a pm if you need anything.......I've become very familiar with the 996 3.4-3.6.....have diaged and fixed at least a 100 over the past 2 years......
the first big project i did at our shop was swapping a 5.2 dme 3.4 to a 7.8 dme 3.6 x51 into a 99 996, with only a rewire....that was 2 years ago and the thing is still tearing up the track.....lol