Done properly and tastefully, aftermarket mods that you might see in the Fast and Furious films can be acceptable. The problem lies within the fact that a large majority of the cars with aftermarket accessories and parts were modded by 16-year-olds in their own garage with the wrong tools. Cars that have heavy aesthetic graphics, giant intakes and mufflers, and colored tubing all over the engine make us extremely nervous about the past work that's been done on that car.