I run the kuhmo ecsta 235 40 R18 on a WRX STI current model and i must admit i am very impressed especially in the wet. They feel solid on the road, not much road noise and good wearing tyres. I have done 12,500 and have given them a bashing, in the dry putting them to the test, they hold. I would go with the Kuhmo ectsta, the 520s i dont rekon grip that much better and are considerably louder and forget it in the wet. Save your bucks buy the kuhmos.