I have an '03 Z with 13000 miles on it. Never in an accident, only worked on by Nissan Techs, I am putting the third set of tires on the front end. Tires cup severly after about 6000 miles. Its like clock work. There was a service report out in '03 to adjust the factory alignment......I did that the problem is still occuring........Any suggestions?

 

https://my350z.com/forum/maintenance-and-repair/66548-attn-z-owners-alignment-issues-please-read-moderators-included.html

Check this thread out.