My cat failed on my '98 V70R, so I had it gutted today. It had actually melted parts of the core. The guy that did it for me said he never saw such a badly failed cat before. What are the chances of not throwing a code as it is? I'm thinking 0, but the shop that did it for me said they think it will be fine after possibly resetting fault codes a few times. I was going to space it out with a pair of spark plug anti-foulers. Suggestions? Thanks in advance for any help.