[funster]

My car came with 18's and other than looking cool, they don't seem to serve any purpose. A 17 would absorb more road shock and the rim would be less likely to get bent. Also on a 17, less weight is on the outer circumference of the wheel which should translate to better acceleration, however slight it may be. Some say that the shorter sidewall will give better response, but I believe there is a point of diminishing returns on this. You don't see race cars running ultra low profiles.