Replaced set of performance Kumhos that had less than 5000 miles w the Michelin Pilot Sports. Couldn't stand the noise and following every groove on the highway. The 911 isn't known for it's quiet highway ride but what a difference the Michelins proved to be. Don't buy anything else for the Porsche. You get what you pay for. The car is absolutely on rails and the dry and wet traction is impressive. The Kumhos were deadly once past 1000 miles of wear in rain. In dry but cool weather it was like riding on tires made of stone. I know summer performance tires are meant to be used in warm weather but 50 degrees is hardly cold. The Pilots are worth every penny and you will enjoy the performance of the car far more..