Is there really a difference in shelling over the extra money for an OEM O2 sensor. I just bought 2 Catco ones. I put in one, but I broke the damn tool from summit trying to change the other one, so I dropped it off at my trusted mechanic. He called me and asked why I went with a cheap piece of crap(56 each) instead of the OEM one. He said I am running rich(Which I know) and that the cheap piece of crap aftermarket one wont do anything about it running rich.

Is there REALLY a difference?

 

It seems to be hit and miss with the aftermarket O2 sensors......personally I would only use the OEM ....you can get them from Dal or Jason for about $32 each + shippn.

 

I would recommend the OEM 02's. Most of the PCM tunners hate the aftermarket 02's due to they are extremely hard if not impossible to tune. Stick with the GM's.
HVY SS