Since the original post is gone let me clear things up.
1) I originally tuned this truck on 10/18/2011 and it was a stock charger/twinned truck.
2) A built motor was done for the truck and the stock charger was swapped out for a Cheetah when the build was finalized.
3) The truck ran trouble free and code free for 30K miles with the stock charger
4) I was paid to tune the truck with a stock motor, being the good guy I am I retuned it for no cost after the build.
5) The time I spent retuning it via emailed tunes consumed 25-30 hours of additional time including many phone conversations with the builder, all at no charge.
6) I involved Ross at EFI-Live with this truck and he was kind enough to work with me when time allowed, we made many attempts to correct the codes and it seemed that some changes made improvements and others did nothing, in the end it was never resolved completely to my satisfaction with respect to the way the truck would run without throwing codes.
7) After almost a month of trial and error the owner became frustrated and contacted ATP-Rob Coddens for a tune......ATP provided a tune that did not code but was unsatisfactory as far as driveability, subsequent tunes provided by ATP threw codes and displayed reduced engine power.
8) I received a call today from a member here that I was being held out as someone who gave up and walked away leaving this customer hanging which is far from the truth.
9) I never asked for any additional compensation for re-tuning the truck or for my 25-30 additional hours spent and I know other tuners would have charged for all their time and efforts.
10) I have at this time washed my hands and given up, I am not going to ask EFI-Live to revisit this as they have better things to spend their time on.
So if anyone wants to take a shot be my guest.........I am done with this truck and these LLM's that obviously cannot be tuned with what is currently available.
Sorry, but I have enough wasted time on this and another truck, I am done with wasting my time chasing my tail on P0299 underboost codes.