People who hate it, call it “pollution.” People who love it, call it “rollin’ coal.” We’re talking about the plumes of black smoke that come pouring out of some diesel pickups. These pickup truck owners are retrofitting their rigs to allow for unburnt diesel fuel to spew from a tailpipe or vertical stack during a fast acceleration. When smoke pours from a pipe or stack, the unburnt diesel is thick and black. An interview with Mark Pyatt of Killer Diesel Performance about the young men and women who love to roll coal in oil country. This story aired on Prairie Public and Marketplace .