Which o2 housing do I have?

[burntheblobs]

While I had my downpipe unbolted, I realized that my downpipe to o2 housing gasket was only 2.25" while both the downpipe and the o2 housing seemed to be 2.5". I am trying to order a new gasket but I can't figure out if I have the evo III o2 housing or a 1g/2g one. Any tips?

 

[mitsuclipsegsx]

Got a pic?

 

[donmagicjuan]

While I had my downpipe unbolted, I realized that my downpipe to o2 housing gasket was only 2.25" while both the downpipe and the o2 housing seemed to be 2.5". I am trying to order a new gasket but I can't figure out if I have the evo III o2 housing or a 1g/2g one. Any tips?

The EvoIII O2 housing has a downward-facing O2 sensor bung (as your looking at the housing from the top with it on the car), while the 2G has an upward/left-facing bung. And yeah, the diameter of the EvoIII is 2.5" compared to the smaller 2G. Hope that helps.

 

[Dream On]

Yeah post a pic. You can tell the difference between a 1g and a 2g by the same and o2 sensor location.