Cay-ute

Does anyone have any experience with the Yokohama Advan tires on a Cayenne? My new CTT has Yokohama Advan's but I did not look close enough while at the dealer last weekend to see what model they are. I looked on Tirerack and they offer an N0 tire called the Advan Sport in 21". In looking at the Yokohama website I saw that the Advan Sport was OE for the 997 but the Cayenne was not listed. Yokohama did have an SUV tire called the Advan ST in 21. I would appreciate any advice you might have.