So I replaced my Kumho Ecsta ASX all season tires, because they were junk. Screamed in every corner, horrible in the rain, it was just a tire with a lot of ick. Since I have winter tires I went ahead and got summer tires. My choice: the Dunlop SP Sport Maxx. This tires is apparently a new tire (like a year old tops) and is Dunlop's flagship tire (they even have a screen saver for it). It has totally changed the character of the car. Where before it felt like I was fighting it through corners, now things are smooth and perfect. They just flow amazingly. They won't scream no matter how hard you try. You could do a quarter mile long burn out (if it was possible) and they wouldn't make a squeak. The road feel is great too. It makes my Arc feel sporty. The size I am using is 225/50 R16, which is slightly different from the 215/55 R16 stock on the Arc, a little wider, but all works perfectly. For anyone interested in getting more from your tires, these are highly recommended.