We're just about done with our Photoshop makeover for this tutorial. The things you can do to a car are endless, and in the future, we'll come back to this car to do some more fun stuff with it. Let's go ahead and add a spoiler to this one and finish it up.
You want to cut a small portion from your hood, where the bends and depth change take place. Take a look at this image for a better idea on what to cut/copy :
Now you just drag that 'spoiler to the rear, use your Transform > Rotate to line the image up with the car top/rear. Erase the portion of the image you don't want seen, and you should end up with something like this :
There you have it - one car made to your liking. Mine didn't even come out like I had envisioned it earlier, but it's a fun process that you can do over and over again, using completely different vehicles for a unique outcome. Enjoy!