It is about doing your homework and being mechanically inclined. My car drives straight and is stable at speed. I am very picky about these things so I asked one of my car enthusiast friends to drive behind me and give me his opinion about whether the car's body is straight in the traffic lane and tracks straight even after the car was professionally aligned. I have been through the whole car and am more comfortable with the Z than some unknown car sitting on a dealer's lot. Also, I do not plan to sell the car so I do not really care what some bean-counter at an insurance company thinks.