Yeah i know what they are, they are the same thing as MIL eliminators. I’d pick them up off you if/when i do my headers and X.
That blows my mind…without o2 simulators? I dont know how you dont have a CEL, even though you used all 4 o2 sensors (which most of the header/x kits do), your cats are still gone!! The up-stream o2 sensors are for engine management and the downstream o2 sensors basically just check to see if your cat is working IIRC. If there is no cat, WTF!? Its obviously not working LOL.