Was at Knott's Berry Farm yesterday for the Fabulous Fords weekend. Great show everybody.
Was at the Ford performance parts display and picked up a free Ford performance parts catalog. In the book there's a section on tuning calibrations. It says that aftermarket tuners other than Ford Performance do a few tricks they do not recommend, such as: Turning off the inferred catalyst, oxygen sensor and exhaust valve temperature protection logic. These parts prevent the PCM from richening the A/F ratio to protect these components which can result in more power under certain conditions. But this drastically decreases durability of the pricey parts which can make the check engine light come on, as well as increased emissions due to failed catalytic converters. Ford also says that they may advance spark timing to potentially unsafe levels meaning to the overall life of the engine.
Just thought this was interesting and would share. The show at Knott's yesterday was awesome!