Gutting the main cat? I don't know of anyone whom has passed emmisions then. Just gutting the Precats? There are numerous stories of people passing with that done. Sadly if your precats are as bad as they were you stand a very good chance of needing to replace the main cat as all the crap from the precats may be plugging it up now. That is what happened with me. No worries now though thanks to headers.
