Not true. If the body didnt matter at all, then why don't we run truck bodies, or bus bodies, or for that matter why run a body at all. While you can change the setup on your car around the characteristics of a body, aerodynamics do make a difference. Remember as well that setup changes are also a give and take. You can add or subtract toe to make changes, but more toe in or out takes away top speed. I guess what I am trying to say is if the body made no difference then why would anybody do wind tunnel testing. It makes a difference.