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To sum up - not enough information to give you the best recommendation.
If the CV boot was torn or loose just on this side, that would cause your CV joint to wear prematurely and fail. If this is what happened and the boot on the other side is ok, then no need to replace the other side.
If the CV joint is not what failed, for instance you cracked the actual axle shaft, then I would only replace the one side. It's unlikely to have a manufacturing defect on both sides.
If the CV joint failed, but the boot was not worn, and you have a high-mileage car, or you track the car, or you drive like a maniac, then I would replace the broken side and re-grease the other side. When you open it up to re-grease, if you see a bunch of metal in the joint, then you know it's time to replace the other side too.
As others have said, to really answer your question we need to know mileage, what exactly failed, how you use your boxster, etc.
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