what kind of muffler is this?
It is DEFINATELY a Flowmaster knock off. It is identical externally, but if it were an actuall branded Flowmaster, it would be stamped with their name along the seam on the top/underside, kind of like the end "INLET" like this:
It is DEFINATELY a Flowmaster knock off. It is identical externally, but if it were an actuall branded Flowmaster, it would be stamped with their name along the seam on the top/underside, kind of like the end "INLET" like this: