The Official Superchips Forum

Last week I had the Flashpack super tuner installed onto my 06 F250 diesel. I immediately realized a HUGE differnce in power, and a 3 MPG gain in relative driving ratios. Today, I had a K&N air intake, and Magnaflo 5" exhuast put on by the same shop, as well as the removal of the catalytic converter. It seems that I have actually lost power, and the MPG's have dropped slightly. I tried logging the Flashpack back in to check for tuning options for the work done today, and found that there are no options. Is there something additional that needs to be, or can be done in order to accomodate for the air flow changes made today?