Factory wheel markings
 

I've read before the factory wheels have dimensions stamped on them near the valve stems? The 18" turbo twist wheels on my 02 S do not have any width outback spacing info stamped on them. The window sticker has them listed as an option. Is there any way to tell if I actually have Porsche wheels or aftermarket copies? Where is this info stamped into factory wheels?

I have seen OEM wheels that did not have the off sets stamped by the valve stems. To ensure you have OEM wheel take a wheel off and you should see a part number on it as in the below photos. First one is a hollow spoke and the second a solid spoke.

<a href="http://smg.photobucket.com/user/cwampler/media/Boxster%20Tires%20%20Wheels/P1130105.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v216/cwampler/Boxster%20Tires%20%20Wheels/P1130105.jpg" border="0" alt=" photo P1130105.jpg"/></a>
http://i.ebayimg.com/t/PORSCHE-17-TW...dLQ~~60_57.JPG

Great thanks for the info.

What Chuck said. Here is a pic of an OEM Porsche wheel with the O.D. and Offest:

http://i46.photobucket.com/albums/f1...psa276907a.jpg

Some OE wheels have them, some don't.