What is the 0420 code delete option on the zzp website for their 1.0 PCM? I'm guessing its downpipe... I could be wrong though.

yes thats an o2 code

The cat failure

its so you can run without rear o2. its also possible the code will be tripped because of a high flow cat, tho I've never had that problem.

I have that code. It's caused by the high-flow cat. A good tune should get rid of it.

Are you trying to get a ZZP pcm? If so, I'd go elsewhere. It's alright if you're not going to mod too much, but it isn't sufficient when you go to lower pullies.