I always thought that a set of locomotive horns (usually three) at 175 psi would be hilarious in a Japanese sports car. The horn diaphragms and air storage tank would take up the entire rear hatch area but a 175db triple air horn blast would stop ANYBODY in their tracks (even if they didn't have brakes).
Also (like an F-86) the discharge of the horns would slow you up about 50kmh. A twofer.