Originally Posted by Mustang10
Would the check engine light turn on if I take out the two back Cats since the sensors are connected to the two front ones? I've heard it and its louder and the persons check engine light didn't go on?
Yes it does go on if the O2 sensors are removed. There is a couple of ways to go about this, you can drill holes in the piping to fit the sensors and then weld them on. Also there is another method having to do with MIL eliminators, but I'm not familiar with that so maybe someone can chime in.