i'm putting in my aem w.b. gauge and i have to install the o2 sensor bung. they say for high output motors to install the bung 32" from the exhaust port and all other applications at about 16" or 18".
i was figureing to install it in the mid pipe, right after where it connect's to the collector. mainly because it's easier to access. would this be a good spot? where are all you guy's installing them.

 

added my bung bout 2in away from stock upstream 02 and at same angle

 

i use the aem gauge also.. being that i have dynatech headers and cats and mids.. i used the extra bungs that are not used as the spot for the gauge.. it works perfect and i get a very accurate reading..

 

so what are you guy's saying? are you putting the sensor in the mid pipe portion of the system or are you putting it in the collector portion of the actual header????
sorry i'm just having a little trouble picturing where you guy's are talking about.

 

I put mine in the collector about 3" ahead of the flange.

 

well i pulled out my drivers side header and put the fitting in the collector. after looking at the mid pipe i realized, not only was there no room to put it before the converter, but putting it in the collector was the lesser of two evils. man i tell ya though it was about 3 1/2 hrs to put in that stupid little thing.