The BAT site suggests that the bar has some lateral freeplay because of the link designs. When the bar contacts the subframe at one of the bends, excessive pressure at the intermediate point breaks a bracket. The BAT bar has little "stops" that prevent any lateral movement through the bushings, so the bar never contacts the subframe.
That's their explanation, not mine. At least that's how I understood it. I have the 21mm bar. I like it.
