Dear all:
Thanks for the support throughout and the suggestions, I have boost finally restored back to 15psi yippie and my EGT's are back down to normal!
The cause...unknown specifically and likely a combination of things that I check and fixed and may serve as a guide for others:
Exhaust, exhaust, exhaust, check it well, a combination of problems from the exhaust system can contribute to lower than normal boost. In my case two factors came into play:
1, excessive backpressure from a clogged CAT, after nearly 300k miles wht do you expect, deal with it accordingly gut, bypass or replace CAT.
2. Not enough backpressure, yeah sounds wierd, but it also turns out that my flex coupler was leaking really badly, and I would surmise that being so close to the Turbo exhaust outlet, too much flow may actually hurt boost
Intake plumbing
found a small hard plastic line that was split, leaking, check your plumbing for leaks with compressed air, winmutt provided a good link to this earlier.
In the end she is finally fixed, sounds more like a singer sewing machine than a cummins now and all is right in the diesel world, now if I could only figure out the e320 and it's darned ASR problem, I'd be right in this world.
