[duramax0386]

I am looking i to geting a mbrp 4" turbo back exhaust. Ive herd the new diesel fuel make it so the motor dos not blow black smoke is this truck with a new exhaust i have a 03 lb7 thanks

 

[Horsepower Upgrades]

I have seen trucks buried in smoke still, if it is supposed to make the trucks smoke less, I have not been able to tell.