Have you modded your car yet? Try a few peltiers on the engine, may be water cool it, cut 5 or 6 holes in front and another 5 or 6 holes at the back and install 500mm fans (blowing in from the front and blowing out at the back), may be a translucent door or two should be cool, repaint the car, sound proof the interior with audio damping material on all surfaces. Just a few ideas.