I replaced the rear upper wishbone control arm looking thing on mine.... It was bent about an 1/2 out of where it was supposed to be. The dealership couldn't belive that that aluminum tray could bend without breaking etc..pmpn8ez said:On the M3, the upper control arm is a big old aluminum piece. I bent one on the track once and I'm still not sure how because of the geometry of the part. The part looks so strong it is hard to imagine how they bend.