I have had EFI Live for a while and have tuned several vehicles including my 2005 turbo Silverado. I also have a 2006 Silverado I put a turbo on. I wanted to run a COS like I did with my 2005, and just assumed I could flash in the 2005 OS and be off and running. Well when I flash in the 2005 OS I get Reduced Engine Power U0107 code, and the truck instantly goes into limp mode. I cleaned every ground on the truck and the problem does not go away. I flashed the original OS back in, and the problem goes away. I want to be able to run about 12 PSI of boost. Thanks