my530i

Those have spiners are those people who is asking for stop-sign ticket. Cops mostly look at the front wheel of the victim vehicle to see if it stop rolling at the stop sign and red-light right turn. In case of the spiner, it creates an illusion that the car is rolling. Now we can conclude that they're asking for traffic violations.

Spiner add weight => Reduce performance => Not for enthusiasist => Immature mind