im pretty sure its o2 sensors because i dont have a cat anymore and the front o2 extension didnt fit into the sensor so it had to be jammed in.Also whoever got Pacesetters i took off EGR but the vacuum hose that was connected to it is still suking ait what do i do with it.Cut it plug it?One last question on one of the test runs the car made a fart sound like a civic why did that happen? It was pretty embaracing.Ill post pics and videos later on.