If a Roadster owner wants the SpaceX package, it will remove the back two passenger seats, meaning only two people will be able to sit in the car at one time. Instead, the rear seats will be replaced by a high-pressure carbon overwrap pressure vessel, which would be “around 10,000 PSI,” Musk says. A series of thrusters will join the vessel.
Musk acknowledges that this may not be possible, though. He talked about what could be released instead.
“At a minimum, I’m confident we could do a thruster where the license plate flips down, James Bond-style, and there would be a rocket thruster behind it, and that gives you three tons of thrust.”