I've haven't noticed any difference to drivability or handling. If anything they would lower the centre of gravity slightly.
The biggest issue with spacers would be any rubbing on the front wheels and potentially the rubber hanging outside the wheel guard (against most road regulations, certainly the UK and Oz, not sure about the US).
As you can see in my picture (above), I only have the standard 17" wheels, and I think the 18" sets have larger offsets already.
Talk to your friendly Porsche dealer for advice. Also, you don't need Porsche authentic spacers, mine are from H&R.
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