Since God made it. Check this video out.
Magnesium Explosion During FD Car Fire Training
2 large magnesium bell housings were placed in the drivers seat. The explosion occurs about 5 minutes into the vehicle burning. No water was applied to create the explosion.
Novacool UEF works on Class D Fires as well.
https://www.youtube.com/watch?v=2D8ZqWUgxM4