I started running into rear toe issues recently after installing a LSD and turning up the boost. The rear end pulls hard to the right then wiggles back and forth all the way to the next gear change. I'm not sure if the additional torque knocked my alignment out of spec, or if the OE bushings are deforming under the additional stress. I did noticed that after the first WOT pull where I experienced this new behavior, my steering wheel is off center (about 5 degrees to the right). Getting under the car, there's no visible damage to the bushings or toe arms, but I figure a new set of adjustable toe arms may be in order. I'm not a huge fan of spherical bearings (if they are not sealed like the M3 bearings)... too many horror stories of people needing to replace the bearings every six months. I came across a reasonably priced alternative to the HPA and RE adjustable toe links that use "hard rubber" bushings. They are made by a company called Manzo and cost a buck twenty five. I figure they're cheap enough to give them a try (until Fe1rx starts to manufacture a proper toe link :-) )
http://www.manzousa.com/index.php/pr...-m-models.html