I was going to ask it too.
If everyone agrees I will propose a new rule: after the puzzle is solved, the puzzler should post the unmodified version of it, what do you think?
Yes, it's a good idea and I've often thought it too.
Occasionally I have also posted other pictures of the same car from a different angle, which I think is also a good idea as the car isn't going to be featured as a puzzle again so the more views of it there are the better.
Trouble is I often can't remember where I got the picture from, but I'll have to start including the source in my notes!
I'll post a picture without the paintwork modification tomorrow (think it just said 'Keller' in tiny script...)