Where is my oxygen sensor?

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Good news. I replaced my cat with a magnaflow, as suggested earlier. It was a little more since I'n in CA, but it did the trick. The old one must have been pretty plugged up. I can feel the difference in power. Unbelievable!
Now I hope it passes smog, since that's what lead me down this road in the first place. Having the FJ run better than ever was a great perk. I'm so excited.
Thanks for the suggestions.
 
Forgot to mention one weird thing, the stock temp sensor is too long for the tube on the catalytic converter, by about an inch. Has anyone else here bought the Mangaflow CAT?
 
Thx White Stripe. I was considering that, but wasn't sure if that would mess up the average temp reading. I'm not sure if temp is taken at the tip of the sensor or somewhere along its body. I will try that though and see if it matters. Thx again.
 
Hope this works. So much for a 'drop in' part :)
Temp sensor is too long so I made a spacer.

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