Hello everyone. I am new here and would like to obtain some basic information regarding my 2007 impala. I have just purchased hp tuners pro to use on a few of my GM vehicles. My first task at hand will be to turn off the rear 02 sensor and active fuel management for the impala. I searched and looking through the beginner sticky but didn't see any step by step write up regarding these two subjects. Does anyone have a write up on turning off the rear 02 and active fuel management (4 cylinder mode) for an ls4 impala ss. Thanks in advance, if I missed this somewhere in the stickies please just let me know