Answer:
My full powers come when my makers are dead. I await a heavy hat to put on my head. What am I?
When you are inside me you will be encouraged to slam other cars.
I am not a toy though many use me for pleasure. I have a butt but I cannot poo.
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.