Not stock 17"s but Boxster S 18"s that are grey and can give some idea of the color on the car I think. These are plastidipped and it seems like a pretty good job. I bought the car with the wheels dipped already.
Quoted from the paperwork he gave me "3 coats black, 2 coats grey, 2 coats pearlizer, 2 coats black, 3 coats anthracite grey, 1 coat glossifier". Seemed extreme to me, but the finish on them is quite nice. I plastidipped winter wheels before and these wheels have a much nicer finish.