I bought headers for my 03 Altima 3.5. It has four ports for o2 sensors. The stock manifolds sensors are located before and after the manifold cats. The headers have the ports located at the top of the headers and 2 on each side at the end of the test pipe. My question is, my post cat sensor wires are not long enough to reach the test pipe, can I just extend the wires or will that screw up the current going through the wires leading to a SES light? Or do I need to buy ones with longer wires already on the sensor? And of course I got to add de foulers. Does anyone know the part # for the correct sensors I need?