Agree that the DINAN is not a real bolt on. I also understand that the factory exhaust is one piece all the way to the flange. What I am suggesting is that any properly sized segment of exhaust piping with a flange welded to it (available inexpensively from a quality muffler shop) can eliminate the need to hack up the factory system.
That being said.....I can't figure out why DINAN chose the clamp approach. Makes no sense to me.. Tips are gorgeous though