I believe Carma Reincarnation used a completely new system, I believe they talked about that in the dev blog. While the system may have been similarly powerful in theory, I distinctly remember it also being less fun than the Carma 2's system, somehow less reactive. Carma 2's approach essentially allowed for the car to be crushed into any polygonal form, best illustrated when you drove the car into the underside edge of an angled bridge or similar. It was rad and so much fun, considering and that was 1998 which still blows my mind.