2017 ram 2500 6.7 cummins. 79k miles. Truck is fully deleted (EGR/DPF/exhaust). Adult driven. Problem started very suddenly. Truck has never had any issues I've owned it and maintained it since brand new. No check engine light or codes, no exhaust smoke at all (usually dumps some black smoke upon heavy acceleration and my tune), no rough start or idle, exhaust brake is working as it should, fuel rail pressure is meeting demand (idle around 4600 PSI / WOT is getting about 20,000 PSI). From my research it should be getting some more fuel pressure at WOT. Boost is only reaching 21 PSI at WOT which is lower than normal for the truck also. Truck has no power very very sluggish. Low speeds feels ok..if you don't get on it and will get to highway speeds... eventually. Made sure all Intercooler boots and the whole intake/turbo system is sealed well and not having a major boost leak. S&B intake Air filter is clean, MAF sensor looks to be clean and good. Both mopar fuel filters recently changed have 675 miles/45 gallons through them/ also tried both brand new Napa filters with no change. I ordered a new fuel rail pressure relief valve to see if that solves anything. Also have a boost leak kit on the way to attach at the turbo and pressurize the system to make sure I didn't miss any possible leaks. It seems to me like a fuel or boost issue but everything I have tried so far has had no improvement. Any other ideas?

 

Are there any codes???