OK so the switch is complete. I did this after replacing headgaskets, installing arp's, a MRBP 3" downpipe, egr block plate and installed the LBZ mouthpiece. The truck runs like a dog. no throttle response. I put on, temporarily, an edge only to see boost. The truck feels like it is not making power and/or the turbo is not lighting. In stock tune terrible, in drive tune lvl 3 it runs much better but not super. Is this because the truck needs to be flash tuned? or am I missing something else? Only code is for egr. On a side not I did also swap MAF sensors. So the MAF that was in the truck is still in the truck.
So I need to update my sig to read 2005 GMC 3500 LLY egr block,ARP Studs, 3" MBRP downpipe LBZ mouthpiece and for the moment Edge Chipw/Attitude otherwise stock for the moment