I did them at the track one day because I have always doubted if springs did anything to help performance. they do not.
This should be 1 hour of labor + alignment.
I did it with a friend, two jacks and about 45 minutes and another 45 minutes to do a string box alignment because I was changing my car every run to find something decent. The key was to remove all of the rear toe and run 1/16th of toe-out in the front.
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