The cats for the S550 are part of the header assembly and completely separate from the factory resonator or where you would install an H pipe. I have seen the use of a catted set of headers or a non catted set of headers on the S550's debated quite a bit in reference to this "ghost" cam tuningThe term off road applies to a midpipe with the cats removed. The ghost cam tune messes with the variable valve timing to make the lopey sound at idle. The exhaust choice will make it sound louder or throatier, but it shouldn't be a requirement to run the tune.
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I was picking up what you were putting downYea that's why I was asking off road headers because the new Mustangs have it in the he headers instead of the midpipe and the midpipe is replaced with a resonator
Lund Racing is the only one doing it as far as I know currently.Nevermind just went on their forum and found out they have not released a ghost cam tune yet for the new mustangs