Painting individual parts in body shop.

[Helomyname]

But how do i move the vinyl on the bumper? When i choose STRIPES and put in on the side, i can't stretch it horizontally. 

My car is Futo.

Vinyls work on two planes, if you will. You have side vinyls, which will spread across the side of a car, and you have hood vinyls, which cover the tops of cars, including hoods, roofs and bumpers. Use something like a shapes hood pack.

Although i do think there should be an option to make spoilers colourable elements.