I just replaced my original equipment tires (Bridgestone RE040) since they were blistering. I swore I would not buy another "Blowtenza" tire, but after reading the reviews on the new S-03s, I took the plunge and am I ever a happy camper!! They have amazing traction and look great. They definitely make the car feel like I just put $1000 in new suspension components. I just can't wait for another track day at Willow Springs.