i have a 2008 6.4 powerstoke with 162,000 miles. it went into reduced engine power , so i had a sct x4 tuner with cold air intake and dpf delete installed. i just picked it up and it is smoking at initial start up. is thise somewhat normal

 

first one has to know why it went into reduced power mode. What was wrong with the motor? What code did you get?

Since you now have no dpf it is possible to have some smoke on a 6.4 due to the design of the piston rings. They are purposely a little loose till it builds some heat.

Work it hard and pack on the boost creates the best seal.