Ok well here's the problem I have a 4 into1 race header on my car and it's awesome and works great but when I plug ina obd2 sensor it says my car is running to lean on bank 1 or 2...(i cant remember)! Sometimes when I come to a stop it will die unless I have my a/c on! Will an 02 Sensor Simulator fix that problem or does the car need to be tuned on a dyno or what?? Does this o2 simulator look like a good one.....www.o2sensorsimluator.com?? Thanks for the help....