I would say the stock radiator on the RS needs some work, esp if you run water-cooled turbo like mine (GT28R). I still remember on a late afternoon drive in the summer when I was on boost for most of a 25 minute trip and my coolant temp stayed well over 110C (that's over 212F at least), and the car wouldn't cool down for a long while. Scared me for a bit and I say never do that until I get the cooling addressed.