rear is not necesary as excessive tire wear is minimal but if you dont like the look of negetave camber then you can either buy a amber kit for the rear or theres a "washer trick" that I'm sure someone has explained in a previous post. As for the front you can either buy a camber kit or if you know someone who knows how to and has done it b4, you can bend the piece b/t the upper and lower control arm in a press to adjust the camber without a kit and thereby no chance of camber kit squeak in the future. I had this done about 25k miles ago and no probs whatsever with my G2 or about a dozen others I've seen done. HTH