Lol boosten, shall we have a sig competition? heh. I use to make sigs for gamers, and modders and spent a year or so learning how to get my own brushes imported. The one unique thing about me is I refuse to use photoshop filters and the background you see in my sig I made as well. I used a 3d modeling software to create a bit of smoke and what not, saved the image and imported it as a brush so I could use it in my background.
Things that could of been improved apon in your sig is a more vivid background, something that brings out the car considering the background is so plain. Smoothing off edges or making them less apparent that the vehicle has been cut out could of been better too. Another problem I see is the text seems to not fit it very well IMO (lol im sry if im ranting on your sig just coming from an artist heh its just Positive feedback on how you can get better). Also you can stay away from every photoshop effect they have to offer lol, that text you can tell is photoshop because of the layer properties you used on the text. Try to use more exciting font too...Well I'll stop ranting boosten it is a nice sig just showing you ways you can improve.
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Inferno Package/CAI/180tstat/3" DP/AL 104 XP's/3.8 MPS/Tuned