RPM arms are better than stock but they still warp. I store my truck on a stand with wheels removed and race once or twice a week. I just found a rear arm that is warped. If the hingepin does not slide in smooth the arm is twisted. RPMs solution was to boil the arm for 5min and bend back. What a pain! Would be nice to have stronger arms that resist warping but not so brittle that they will snap when taking a hard hit.