I have 03 G35 6MT coupe. I'm about to purchase AEM wideband which I'm used to from my teg & eclipse. There are two catalytic O2 sensors. Which one is the best one to use for my AEM wideband? I'm just going to tap a hole and tig weld the bung onto my test pipe prior to installing it. From my understanding, driver side is leaner than the passenger side... Can somebody confirm this? Or, do I need to get signal from both catalytic in order for me to get accurate reading?