I'm going to be quite honest with this photo's 'review'. I hope you don't mind.
I love the background and the blurring you've done, they look fantastic, but the car I'm not so keen on. The black parts of the bodywork and the brighter reflections look fantastic but for me, the yellow road reflections look a bit too crazy. However, that doesn't seem to be your fault because GT4 tends to do that a lot and it would be quite difficult to clean it up properly.
The windows are another thing that stand out to me, I feel they've been oversaturated and have got that 'rainbowed' effect to them. Cars have this in real life to some extent, so they would simply have to be desaturated a little and it would look quite neat IMO.
The rims are a bit of a mistake though if you ask me. They look good on certain cars but are overused these days and they don't suit the Evo one bit. You have, however, managed to blur them better than I could when i tried. Mine ended up looking like some sort of chrome jelly...
Overall it's quite a neat shot with some good blurring and composition, I just think it could do with certain areas being desaturated and sharpened up, and a quick wheel change. I know for a fact that you can clean up shots like this better than most people can, it's just knowing when to stop that seemed to be your problem with this one!
BTW, I hope you don't mind, I took it into Photoshop to have a play with it quickly:
The biggest change is probably the windows and the general colours. I also did some smoothing and blurring here and there.