I drove my Speedster (Pearl, in my photos) to the "Porschefest" at the Museum of Transportation in Boston last Spring. I got there a little late and was directed to a place in the middle of the show field, away from all of the other 356's.
About mid-day, as I was rummaging around in the cockpit putting things away for my trip home, someone comes up to me and says: "I hope you're not driving that thing home like that."
I just looked at him and asked "and why not??"
So he replies; "Well, it doesn't have proper bumpers on it - THOSE are not street legal."
"And WHO are YOU?", I asked....."The Bumper police?" as I looked at my Nerf bars.
"I'm just telling you", he replied......."You'll never get two miles from here with those fake bumpers."
"Yeah, well.....thanks for your input, I think....." and I got into the car and drove it home (over 50 miles), have been driving it all over the east Coast ever since and never a question of it being "legal".
As my old boss used to say; "it's always easier to appologize afterwards than to ask permission in the first place."