Check that the doors, hood and trunk all open smoothly and close with solid sound.

Afternailing a screen to trees in his backyard, he set a 1928 Kodakprojector on the hood of his car and put a radio behind the screen, testing different sound levels with his car Windows down and up.

To minimize wind, road and engine noise , there's a lot of sound insulation located under the hood and floor, and in the doors and dash panel.