So i stopped by advanced this morning and had the run a check on my 2000, 3.8l camaro....turns out all three of my o2s are bad, and for all three they qouted me a lil under 200. I know i can get them cheaper online, but i dont know what im looking for. I know that all three of them arent the same. Can someone help me by telling me what i need....and also, if i get cheap ones will it hurt my performance?