[tykrz]

I hate to say it but re-install the old exhaust system. I don't know about all these mods....exhaust, pcm tunes, air intakes, etc. Manufacturers spend billions of dollars in research and development on products and then we come along and try to reinvent the wheel. I think these trucks run best when we dont monkey with them. Bottom end torque is more important than a teeny bit more power at 6000 rpm. How often do we drive at 6000rpm going down the highway?