I have no problem with coal rollers. It’s their dime. That being said, one of these morons is going to get someone killed or severely injured because the rollee can’t see the road ahead, or someone else can’t see the rollee. Then the laughing stops.
It is all unburnt fuel. Total waste and doesn’t do anything for performance at low end.once the turbo finally winds up then you get some efficient power but not until you sustain high RPMs for quite a while. Until then all you are doing is melting pistons and turbos. I run near 500 hp with almost no smoke. I’ve seen trucks hit 140 in the quarter that hardly smoke more than mine. ‘06 Cummins 5.9= bad ass engine