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Porsche's AWD systems work pretty well. Benefits are more traction at the expense of an extra ~200lbs of parts. As stated above, its mostly the added weight that you notice (especially on the later models, eg 997s and newer, as the computers do a good job invoking the front wheels only wheen needed). The steering is a little more numb and the car feels heavier.(because it is).
I believe you can convert from AWD to RWD by removing the front driveshaft, differential and half shafts on the 964, 993, and 996 models. Each model likely has a few other model-specific changes to make it work, but the conversions are well documented. Unfortunately, on the 997s and later, PASM (stability management) is integrated into the AWD system, so removal of the front diff (the heavy part) causes computer errors. I think a few have done a work around, but it's not widely or done.
Fun fact: There is "drift hack" on the 997s, where you pull the e-brake just enough to bring on the parking brake light. This signals the computer that you're possibly trying to slide the back end and will disengage the front wheels allowing the driver to do sweet smoky donuts or slides if that's your thing....
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