Helping an A&P do annual on a Debonair, noticed the right side muffler missing flame cone. Ordered a new muffler from A Well Industry known shop. Installed new muffler. Looked up into tail pipe and then noticed the the flame cone is reversed from what is normally seen, the cone is pointing up toward the manifold, opposite what is normal - pointing down toward tail pipe. (The photos show the flange end that fastens to the manifold has the flame cone pointing at it). We surmised that it was assembled wrongly at the shop. The well known shop says it’s OK. We worry that at every inspection will look up into the tail pipe and say the is flame cone is wrong and needs replaced. What to do?