Just a reminder of what the owner's manual has to say about using slicks at events:
Quote:
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The fitting of racing tires (e.g. slicks) for sporting events is not approved by Porsche. Very high cornering speeds can be achieved with racing tires. However, the resulting transverse acceleration values would jeopardize the adequate supply of oil to the engine. Porsche therefore will not accept any warranty or accept any liability for damage occurring as a result of non-compliance with this provision.
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Wikipedia consideres R compound tires a form of "slick" tire; no idea if Porsche does or not.