[lbszr]

I ran mine with stock set up. Stock springs with Vbp 32 & 26 solid bars. And what I like the best now is vbp 1147 front and 6xx rear spring with the 32 & 26 bar. It's really hard to tell what that spring rate number compares to, but from what I figure, it's stiffer than anything that came on the c4. It understeer terrible with stock size tires, but great with 315 square, it actually favors oversteer now. If your going to keep stock size, maybe lower front spring or smaller bar.

Custom alignment helped a lot. 2.9 neg camber .03 inch toe out, 2.1 neg on the rear with .06 inch toe in. It was corner balanced also. The spring from vbp is adjustable for the balance. This works for the track, don't know about autocross. Tire wear is pretty even with this alignment on hoosier r7. The stiffer springs allowed it to go lower without bottoming out also. It has very little body roll.