evo 3 o2 housing

So what is the deal with the evo 3 o2 housing I see that the 3 bolt is for the exhaust but what is the other litle hole and one bolt for? help explain I am confused!!!

 

[TSimage]

/ubbthreads/images/graemlins/confused.gif

 

[SouthCaliVR4]

other that a slight angle difference where the down pipe bolts up they're same as a 1g/2g in so far as mounting & hardware is concerned. do you have a pic of what you're questioning?

 

I am sorry to say I do not know how to post pics but there is a 2 bolt flanged opening for the turbo and then the other side has 4 bolt holes and to openings one seems to be for the exhaust exiting and there is some hole next to it

 

[tsiboy]

you have it backwards. the 4bolt holes attach to the hotside of the turbo and the two hole flange is for the downpipe.

it also has a hole to mount the heat shield and oxygen sensor

 

Ohhh well thank you very much for clearing that up muh dawgs!!!