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Just a suggestion but if you really want to sell them you should list them for about $300 and be prepared to take $200 or $250.. There is little to no market for 18" Cayenne Turbo wheels. After trying to sell a set with decent Micehelin tires for 2 years I finally took $300 a couple of months ago. I advertised on all of the usual outlets (PCA local and national classifieds, Craigslist, local independent Porsche shops, etc.) and there was very little interest.
They make very good wheels for winter tires, and actually BBS. That is why I bought mine. But the others are right, with a full set of tires (with alot of tread), prices are amazingly low.