AlvinByars: Here is copy of the information from Powerchip directly, which may answer your question.
"The Powerchip is designed in unison with the factory engine management system, and will comply with any emission test in the same way as a standard vehicle. Furthermore, the Powerchip enhanced vehicle will continue to utilise the various diagnostic scan capabilities as per factory specification, which means that the dealership or factory cannot tell that you have made any changes to the software. All items offered by Powerchip are warranted to be free from defects in workmanship and quality prior to installation. This warranty does not cover abuse, misuse, labor, faulty installation, failure of related or unrelated parts."
If this is true, mums the word!