I could actually change my order as I found out recently, there is a certain moment in the production process where I could change the color without delaying my car (this is not something you can usually do, so please don't bother your dealer because it is more complicated than it sounds) but I decided not to do that because I'm still not sure about my color choice.
I ordered agate grey but I actually like white a lot, it fits the car very well and it looks good with the black/Carrera red bi-color interior I ordered. I saw this combo on the moscow presentation car but didn't realize until recently how good this combination looks LIVE. I'm not surprised Porsche chose this color combo for presentation purposes.
The color choice is really difficult. Dark colors don't look good in my opinion because they hide some of the Turbo/S design highlights. Also, due to the smaller and less obvious side air intakes, the 991 Turbo/S looks almost like a normal Carrera from the side and even more when the car is dark or even black and you cannot see the side air inlets.
This is just my personal opinion!!! Right now, white and race yellow seem to be the best looking colors. Race yellow is extreme, I agree but I find it more suitable than the guards red (too Ferrari-ish). Silver tones look good, the lighter, the better but they kind of add some sort of elegant touch to the car and I'm not sure I want this for such a car. Darker colors look nice of course but they really hide the major design elements.
Color is a matter of choice though. I wouldn't order Lime Gold (this is really extreme, unless you REALLY want to attract attention...), I wouldn't order Mahagony met. and even Sapphire met. isn't really my thing, it just makes the car look elegant.
So while I am more inclined towards white now, I keep my agate grey order and if I really don't like it, I will use foil to switch to matte white, a matte grey or a matte light grey, not sure yet.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S (Sept. 2013), Cayenne GTS (958), BMW X3 35d (2013)