Now hit the CTRL key, and click on Layer 1, It will highlight the car's hood. Now go to Select/Inverse, and hit Delete. You should be left with the car's hood filled with Carbon fiber, like this:
Now select Layer 1, and go to Image/Adjust/Desaturate, then Lightness/Saturation, to make it darker. Reselect Layer 2, and mess with the Layer's options (you know, Multiply, Lighten, etc) so you get a pattern that looks like it has some reflections.
It should look like this:
