Catless or not
Well it depends. I know that some shops won't remove cats legally, and some techs still work after hours on private projects. Hope you know this person well or it can come back to bite you hard.
Around here we have had problems with people stealing the cats off of cars and SUVs. Hint hint...
Buy the test pipe from SLS or something, and you can have a shope do it most of the time. If they don't see a cat initially they will usually also even put a pipe in place of it, or install what you hand them.
This might work with most shops unless you're in California, or anoth state that uses the California standard.
If you order the test pipe from SLS tell Eric that Jon with the Speed 6 sent ya.