It's impossible to tell you what to do to it unless we know what all is done to the truck and what year make and model it is. Once we have that info we could help. But for the most part a bigger free flowing exhaust, egr delete with delete pipe, and cat and muffler deletes will help. Tuning will help most of the lag issues but the other mods will help as well. The banjo bolts and blue spring mods aren't going to decrease turbo lag it will only make sure to allow your injectors to have proper fuel pressure.
I seem to have good boost. My cystic shows a Max of 29 at times. I haven't looked at vgt duty CYcle. No other tuning. Lag seems pretty bad. If I pull out in front of a car about 500 feet away, they are on me pretty quick. Also I'm getting heavy and thick black smoke again. I run cetane boost on every fill up too
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