Honda put the sensor there in the first place. I would leave it where they intended.

Also, if it's a 1-wire sensor it will heat up quicker in the oem spot as well.

 

i've got mine in the manifold before the turbo. sometimes i get a CEL for the o2 sensor but i just flick the key off real quick and it goes away its a new o2 sensor.

 

i have my O2 in the mani...no problem.

 

I'm keeping mine in the Middle of the manifold. There has probably never been a serious conflict w/using the stock O2 position, so why worry about it? Unless it is bothering you, I say forget about it, why complicate things where it's not necessary...

 

I have a lot of research on this at my home computer, I'll have to post it up sometime.