I have no idea how or why it broke. I wasn't boosting it high or driving it hard. It was virtually brand new and probably only had 500 miles on it. I just casually took off from a light in first gear and then shifted into second and the pedal went to the floor and didn't come back up. I pulled off to the side of the road and popped the hood and saw the linkage laying on the fuel injectors. I contacted moderern performance and they set me the butterfly arm and spring to fix the broken bolt. I haven't had any problems from this set up so far. Maybe it was just some cheap material they used.