They've helped with twist & distortion in everything I've put them on: a '73 Nova, '73 Camaro (both being stub-frame fronts & unitized rear bodies), 2 Dusters, '64 Plymouth wagon...one of the Dusters has made several hundred passes on slicks since new, low-10s, has been on the rear bumper, and the doors still close like a new car; subframe ties & 6-point cage. Both Chevys instantly handled more predictably and all instantly felt more solid.