is this a serious question??
The 911 is my third Yellow car and not counting the first one which was totalled by my dealer technician on a joy ride, the second one sold for a premium over other similarly spec'd cars (Audi S4 Avant).
There will always be a market for (specially in a high performance coupe arena) unusual cars and they'll bring more money then a car where the buyer has lots and lots of choices.
True that there maybe less people in the market for a SY car versus a silver one (part of the reason porsche paints more silver cars than yellow in the first place), but those who want it will pay more generally; a yellow Ford Escape not being one of those cars.
My feeling is that you already have a car that gets attention. Why the hell do you want to detract from that
. No such thing as an understated 911. I love them all.
But you have to ask how much more will people pay for a SY widebody car without a sunroof and I hope the answer is LOTS
