While I wouldn't go this far I do have to wonder why you showed the car disappearing at 18 seconds. That seems like really bad form if you're trying to promote something.
Who's that bashing, a guy with zero to none movie making experience, and a lame insult to other people's work?
If you're really going to sh*t in someone's thread, you could AT LEAST do a decent job on it. So either do quality bashing, or step aside, and let the professional assh*les (I.E: me) do their job.
On topic
1. The above mentioned car disappearing was a bad thing
2. If you overlay sounds, do it in all the movie (unless you're splitting the movie into different sequences, which is not the case here)
other than that, it's good. I liked it, even the music. Crashes were nice, and added action to the action. The sound syncing could have been a bit better, but you'll learn. The camerawork was decent, and the video left an overall good impression on me. What I'd do better though, is the finish line crossing scene, I wouldn't freeze frame, I'd slow down as much as possible, but it depends on the PC specs...