Here it comes, watch out:
The first photo in the Dark Part, the B&W, looks so fast and the front of the car looks so evil! I guess that's a charcoal effect or something similar that you used, right? The #4 shot is a good partial car shot. Look how wide those tires are! One noticable flaw is the liscense plate surround; it's really jagged. It would only take a few minutes with the smudge tool to push, pull, and blend that around to get a nice smooth edge. My favorite of this set is the #7 shot. It looks like he's on a mission to get to race and kick somebody's ass. I love how the stripes are so bright.
Now, the Light Part. The background in #2 is amazing! I love the yellow tint, it goes well with the red car. In the #3 pic the texture is really cool. Is that a film grain filter or something? Everytime I try the film grain thing it messes up the highlights and stuff. I like the texture, the straight lines on the ground, the dark car and the uberbright background on your #4 picture. But it has weird vertical lines running through the rear and side of the car. Did you mean to do that, because it looks not so great. But besides that, it's a great pic; I can see why you made it your avatar. On #5 I don't dig all the satuation on the body of the Viper. I drowns out all the curves and reflections and such. The background is really cool, though. The last picture is definitely my favorite. The background, once again, is astonishing. It's so disorted and has so much variation in its brights and darks. That's a nice drift you got there; it's reminiscent of how the Mopar Viper smokes the competition in the American D1 championship.