best place for probe is on the #1 runner of the exhaust manifold....
I've read that also. Post up if you find the info on itNX$paniard said:well i have heard something about having it in the downpipe to increase the life of the probe....but you have to add a certain amount of degrees to know exactly whats comin out at the head to be able to attain the optimal reading.. do a search about it its on here somewhere...