Knocking on wood and all, but I've never been pulled over in a Porsche in the 17 years I've been driving them. I guess not driving like a jackass helps.
Edit: but there's no illegal parts on my car that I'm aware of. Everything is either OEM, OEM-replica, a chip and a rear swaybar. Although I supposed my 951 rocker extensions might have been from a stolen car. 
BB.