I too went with the cheapola solder your own O2 sensors. About 80$ for two. Put them on the wifes car. I put the high dollar bosch 75$ X 2 on mine last year but thats cause I wasn't hip to the Walker brand which appear to work just fine. Just clip the existing connectors off of the old sensors and follow the supplied wiring diagram to solder them to the new sensors. About 45 minutes to an hour's worth of time. Whatever you do don't get any of the high temp anti-seize on the sensor whilst applying it to the threads.