Realistic exhaust smoke, for diesel trucks

I would love to see someone make realistic exhaust smoke for diesel trucks like rolling coal and stuff like that and, maybe make the already pretty good looking smoke on gas cars even more realistic.

 

I agree, this would be pretty cool.

 

of course you would

 

Just to clarify, it is already realistic.
Rolling coal is a modification, and not something trucks (or any diesel vehicles) come with from factory.

 

I'm not a greenie or anything but rolling coal is a modification