1G vs. 2G O2 housing

[oldman]

Hey guys, how can I tell the difference between a 1G and a 2G o2 housing. I just bought a ported and polished 2g o2 housing from one of the members here and it looks just like my 1g housing. I remember reading on vfaq that the 2g's o2 sensor is locate near the bottom of the housing but this one is at the same spot as my 1g. Please help me verify. Thanks.

 

[DSMSpyder99]

http://www.vfaq.com/mods/porting-O2.html

 

[oldman]

According to the article, he sold me a 1g then. uh..this sucks.