https://imgur.com/a/mBEARNe
Same album, but added some better photos. It does look as though its this:
https://www.cjponyparts.com/magnaflow-cat-back-exhaust-kit-competition-series-3-stainless-steel-gt-2015-2017/p/CBG83/
I just picked up a 2016 Mustang GT Premium yesterday. Dealer did not have stock exhaust, previous owner put something on. Its loud, like real loud. I do not mind that, but the drone in the cabin cruising is not enjoyable.
How can I go about resolving that? I am going to crawl under there later...