T4 arms will break if you hit hard enough, but if you don't wreck much it isn't a problem. With my Factory T4, I broke a rear a-arm about 2 months ago and I don't even remember the last time I broke a front arm. I swear it has been at least a half year since I broke a front arm or more. I don't wreck much and go often without getting marshalled. I am about ready to replace the front a-arms though, they are starting to get sloppy at the hinge pin!
