I just put on an ITR cat on my 00 LS, and now its throwing a code 67 CEL. i believe this is the catalyst inefficiency code. 94civicEx linked me to the FAQ thread but the names of the codes arent the "official" names for some of them.

Do any of you know why it would do this, aside from the cat or 02 sensor being bad? Like any incompatibility issues (too much flow for an LS etc) or something of that nature?

Thanks in advance.