You've got a lot of work to do to "pimp" that ride! I can see how that would be a nice goal for the new year though.
As for the photo, the first thing that jumps out is the darkening of the sky. I can't say I argue with your thought process on darkening the sky, but the execution could use work. The easiest correction would have been to use a Polarizer or graduated Neutral Density filter while taking the photo. The purpose of that would be to protect the overcast/hazy sky detail from overexposing while you expose correctly for the darker foreground objects.
You've lost a lot of detail in the blacks too, which seems as though you would have done intentionally in your processing. It seems that you've really pushed your contrast slider up or something. The whites on the rocks are completely blown out while right next to it is total darkness. Contrast is good, but make sure you don't lose detail for the sake of contrast.
You can only hope that Xzibit has an interest in DPC . . .otherwise, good luck with this one, you'll need it AND the whole year! I don't know what it is, or if it is on purpose, but the masking seems a bit odd around the windshield's lower left corner.