I still think you should get some software. You're missing all the fun!!! OK, well not all the fun, how about most of the fun!

 

Does it give a "cat efficiency error" on one or both banks?

You may have a bad check valve this causes a rich condition and overloads your cats. Or need new cats under warranty.

Software won't fix your issues unless you go with something like FVD which disables the cat reading function...

 

I would but I'm under warranty. No way am I willing to risk losing that with some of the repairs I have already had!

Thanks for the info! I will get the code from the dealer today and see which it is. If it is one bank vs both what is the difference?

 

It is both banks. I spoke with fabspeed and the cats are bad... Replacing the cats will make the used exhaust I bought more expensive than buying one new...

 

You might try cruising on the highway for some distance to see if the heat will clean the contaminants out of the cats.