Actually, I think it looks pretty damn good, with one exception. Kumho lettering is only on a small portion of the tire. The original white letters went most of the way around the tire. I think it may look a little better if you highlighted other areas to make it look like more of a continuous circle.
Other than that, it is a little funny seeing an asian sounding word like "Kumho" sticking out on the side of an american muscle car. But aside from the odd cultural difference, I think it looks great.