I have the PCV and the autotune, but have yet to install the autotune. The original 02 sensor has to stay in the exhaust for the 02 optimizer included with the PCV (This controls the closed loop section of the map). An additional 02 sensor is included with the Autotune which you will have to weld an additional bung into the exhaust in addition to the existing one. I am going get a new exhaust before I do this mod.