ya true but my grandpa has worked on school buses for a long time and he says black smoke is unburned fuelWell hm. You could get beefier injectors but that comes with other stuff like tranny upgrades. Or a custom chip/programmer with custom tuning. There is a ton of stuff you could do. I don't smoke much either lol, the truck in the sig, smells stronger than cows but y'just can't see it.