Lowered GXP's
https://ls1tech.com/forums/ls4-perfo...-question.html
https://ls1tech.com/forums/ls4-perfo...tire-wear.html
the list continues if you do not find you answer.
You have lowered the car which has affected the camber of the tire. There is no factory camber adjustment on our vehicles. So to put the camber back to specification, you need camber bolts for all four if you changed out all four springs.
And don't worry, the alignment guys will know what to do with them.


