I don't know to much about them but that they are a wider range for the air/fuel. I got one and put it in place of the o2 sensor were the cat was. The other two are normal.
I got it from my buddy who is a big "tuner car" guy. I think they run about $80 or so.
I did have one problem, truck was running like shit, I pulled out a plug on the drivers side and the plug was just black. Pulled out the rest on the DR. side, they were all suity. Turned out the 02 sensor on the drivers side of the "Y" pipe had a wire riding on the front 4wd shaft, so it was shorted out. Other than that, plugs burn clean, and no CEL
Last edited by pooleo; 12-08-2010 at 09:28 PM.