I have to replace both my o2 sensors and the cat (adding test pipe). I've read the one post about using a specific Civic sensor for the primary and there are no issues in using it, just have to wire it up. Seeing how it is around 50 bucks shipped versus 180 (cheapest i could find for the OEM) it seems the best bargain... however you have to wire it into the existing o2 wires. I have installed many car stereos, so wiring is fairly rudimentary to me. However, i suppose the question is... how much of a pain in the A$$ is it to wire the primary sensor and do you guys think I should do it? I am confident in wiring it. I will be using Bosch universal for the secondary o2 with the mechanical o2 simulator for the test pipe.