I was just wondering if i were to install the ca dp w/o cat can i use one of those o2 sensor spacer or the other name for them is defoulers to avoid getting the check enige light? my buddy has a sentra spec v and he used one of those o2 sensor spacers and he didnt get a CEL. any input would be greatly apprieciated.

 

I don't know if anybody here has tried that. There are 2 sensors on the Cobalt down pipe. Pre-cat and Post-cat. The post cat one would be your concern.