I am installing a mopar header and need to extend the oxygen sensor wires so they will reach the hook up in the wiring harness because the fitting for the sensor is not in the same place as it was for the stock exhaust system. can I just splice some wire in to extend them,or is it a special kind of wire that I need to use? what kind of connectors should I use? I know it will have to be very water proof and heat proof,as that is a bad area of th engine compartment. i have done some wiring before,but not in an area that has to be this sealed. thanks,Ben