[mjw930]

In addition to Jim's excellent reply You need to know that it's not the diameter of the wheels that's the the problem, it's weight. 18" wheel / tire combo's tend to weigh more than 17's. 19's would weigh more than 18's BUT you can certainly go with 19's if the wheel / tire combo weighs as much or less than the factory 18" combo. Since I don't have the weight of the tires I can't make an easy recommendation but I think if you stay under 24 lbs on the wheels you should be fine. Of course, that means fairly expensive forged or modular wheels AND there aren't many made with the proper offset AND the 19" tire selection is not the best in the proper diameters so going to 19's is really more trouble than it's worth IMHO. Besides, you aren't gaining any performance, it's a 100% looks issue.