coal rolling happens when a driver of a diesel truck floods the engine with more fuel than it can efficiently process, emitting a thick black plume of exhaust across the road
I have seen a kit on amazon that plug into the exaust tip and just pump a mist of diesel right in the hot tip. Crazy shit people will do just to piss off others.
Just like those fucking light bars that shine a thousand Suns in your face while driving at night. It's illegal but they turn it on only to piss off people when there is no cop around.
Depends on the engine. On an old cummins theres a screw you can just turn up to eleven. On more modern stuff you need a specific computer tuner, which the EPA made very hard to get a few years ago.