Painting woofer cones
 

Is there a way to paint woofer cones so it matches your cars paint? How would you do it without it cracking due to the vibration and movement?

Off the top of my head: If it's unsealed paper, a light spray painting would probably be okay and last pretty well. If it's sealed paper it might still be fine. For plastic, you'd need a plastic-specific paint and I expect results might vary depending on the chemistry. Don't paint the surrounds, both because it might dissolve the surround and because it'll probably flake off.

painting the cone adds mass and can change how they react which will change how it sounds.

In theory, yes. In practice you can drill a bunch of holes through the box and the cone and most people wouldn't be able to tell.