Personally mate, it aint the best, i think a few things need working on.
The background is blurred too much, maybe tone it down a bit to a 0.1 gaus blur. The signature also has two senses of flow, although it does look like it is splashing through water. The main problem i have is it just looks like the car has been slapped on and not very well blended, maybe make it so the front of the car looks like it is comming out of something, so cover up the back bit with some effects and brushing.
Only my opinions bro, still a sick job.
He Who Dares Wins And i'll die to win, cause i'm born to lose Fucking Civilian