The model is 4 inches wide and .25 inches thick. You should expect to paint the after your done printing it. To mount it to your friends truck, simply purchase a flat refrigerator magnet from your local craft store.
You should use ABS and acetone vapor smoothing to get a good smooth finish. Try printing it with 40% infill and at least 1mm top and bottom thickness. The piece will need to withstand the heat from being outside so dont be afraid to use more filament. Once smoothed, you can paint it with a silver or chrome spray paint. Then go back in with black to highlight the lettering and black inset border.
Its a 3D world out there.