I went with the Kmac for two reasons, one I wanted to replace the bushings in the arms with poly and the second was that I wanted to lower the car some more. I cut a full coil off the front and even with the Kmac one side is still .2 deg out. If I had used just the bolts there wouldn't have been enough correction to get them even close to stock spec. I got a deal on the Kmac's so I couldn't pass them up too!