The SC430 is less a sports car and more a grand touring machine. Drivers who prefer the SC over the German automobiles are generally drawn to the quiet smooth ride and general isolation from road conditions. Precisely why the Porsche, BMW, and Mercedes dirvers don't like the car. As iolmaster points out the tires make a very noticeable difference in overall ride characteristics. I currently run the Bridgestone Turenza Surinity on a 2004 SC with outstanding results. Runflat tires are notorious for their rough ride and tendnecy to skate on uneven pavemant conditions primairly due to the stiff sidewall design.