OK, trying to do my first custom tune with SCT + PRP + INNOVATE O2 WB sensors data logger. How do you know EGR is ON/OFF STATUS in order to modify cells? As far as I collected info, modify cells USING WIDEBAND AS DATALOGGER in this order: 1. With engine at idle. 2. Crusing, light throttle. 3. Moderate throttle. 4. WOT, from 1500 to 6000rpms 3rd gear (if AFR above 12.5 stop!). So again, How do I know which EGR OFF or ON cells to modify in each of above 4 scenarios?