ACTIVE SPOILER
Its really weird for me to add a spoiler for a car that has an active spoiler. Make an animation that when your driving really fast or you press a certain button the active spoiler activates which makes you drive slightly smoother. Example: the Koenigsegg Regera or the Bugatti Veyron. These cars have active spoilers. You can also have an option to remove them when customizing so it will just be flat