I have Kumho Ecstas 205/40R/17 for my contour. I probably going to put them on my contour since i'm not selling my contour anymore. I have people say that that tire wont support the weight of the contour with the 2.5L engine. But a guy at a local performance shop (Underworld Customs) has a SVT and he had those same tires on his car before he put on his 18's. So please help me so i can make a decision to sell them or to keep them. Thanks!