I have them ( courtesy of previous owner - not sure it was also a factory option, but these are after market ) Very thin, very close together, in grey which matches the interior color of my car. I love them. I think it underscores the superb curvature of the body, it elongates the car somehow and seeing it
side by with another 968 iris blue which did not have stripes only reinforced my preference for the car with them..
That having been said, I know I run against the grain here.. most prefer to leave the car naked. Also, not sure about applying a dark stripe on a white car - that could stand out way too much IMO. Even if it does match a black interior <img src="/forum/images/smilies/968/dry.gif" class="smilie" alt="" />