could be a problem with the vgt? so u got a dpf delete tune with a straightpipe then or? mine lags a little and smokes alot on a biggish tune but after about 2-3 seconds of dumping smoke it hits hard jumps from like 5 psi to 37. then shes gone. how long does it take for them to actually hit again?2008 6.4 .It seems to have excessive smoke on take off and hardly any power until it finally lites the chagers.It has a canned sct no dpf tune on it and if you let out of the throttle,its really hard to lite back up????????????