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Does anyone know much about thiese things???? my buddy has a mustang and put then on his O2 sensors and said i should look into it when i get my exhaust re-built????
I think you are talking about O2 simulators. They allow you to replace the downstream O2 sensors without bringing up the MIL lite if you do away with the cats. Only needed in OBDII, 1996 & newer cars.