I am going to purchase the URD CAI and the URD MAF Sensor Calibrator for my normally aspired 2006 X-runner. My questions are: 1. Is the plug and play version of the MAF sensor calibrator worth the extra money? 2. Should I replace the MAF sensor itself while I am at it? 3. Will my truck be able to pass inspection in NC are this is installed? Thanks for your input.