Another bad note on the 18" wheels is that tires last half as long and cost twice as much. Those tires, because the sidewalls are stiffer, use the tread up more to create traction. Not only that, but 18" tires typically but not always, have lower tire wear ratings (stickier tires) because they typically go on higher performance cars. I had 18" wheels and got rid of them cuz I was going through those expensive tires way too quickly. A 17" wheel with a moderate side wall is more for me. I get decent looks, good ridability, and more reasonable tire wear on a much less expesive tire. I just dont know if they feel there would be a big enough of a demand for a high dollar wheel on a fairly inexpensive sports car when compared to the Viper, BMW and Corvette where the customers typically have more disposable income. Mass producing an 18" wheel and creating a stock of 18" tires is not something that is cheap.