I’m sorry to say but modern diesel vehicles that haven’t been egr deleted or dpf deleted do not produce black smoke older will if they have bad injectors or fuel system has been modified with out upgrading the turbo. Also light duty trucks like my 99 f250 7.3 powerstroke didn’t have any emissions for it be sides a pcm…

Hey epa what about the vehicles that was only given a pcm valve for emissions stardards are we still going to be able to modify them to race only as well or r u going to try to ruin that for the modified community