It would sound just like the conventional side exhaust would.
Seeing as you can find very detailed build pictures of that stang....I think we know exactly how hard it is.
I like it. But it doesn't flow well. I would have rather seen him blend in some saleen/cervinis side skirts, then do the side exhaust out the side a little lower than where it's at. That way...it looks more complete and not just..."I need exhaust to come out....how about.....hear".
A great fab guy can do anything. We all have our own taste.
You ready to cut/weld/insulate/etc?