There were nine different takes of the famous grand finale chase scene where the black Dodge Charger blows up. Nine High-Pressure Gould Valves were used between a pressure tank and a weakened fuel tank that was remotely controlled via radio control. When the valves were opened, the air pressure from the pressure tank flowed into the weakened fuel tank, causing an explosion.
San Franciso had a city ordinance against fiery explosions within city limits to use no pyrotechnics. So instead, the flames were added in post-production video editing.