Flowmaster 8525551-Z 50 Series Street Muffler. This muffler in new and unused but it does have surface rust on it as it has sat around in a garage for a few years, this can be seen in the pictures. Three 2 1/2" new clamps are included with this muffler, Napa part # 733-5337. The inlet on this muffler is 2 1/2" and both outlets are 2 1/2". The box is in rough shape.