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To all who question , Resonators or Mufflers . The way the stock Cat Back Exhaust is installed is in two parts ; part number - 68260150AA - is the Muffler and Resonator Assembly , and part number - 68260151AA - is the Resonator and Pipe Assembly .

Part number - 68260151AA , # 10 in the picture , is described as RESONATOR AND PIPE .
Part number - 68260150AA , # 7 in the picture , is described as MUFFLER AND RESONATOR .

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Part number - 68260151AA includes ; 1 resonator with connecting pipe .
Part number - 68260150AA includes ; X-pipe , 2 mufflers , 1 resonator and connecting pipe .

These are the parts as described on the Mopar.com parts website .

68260150AA - Muffler and Resonator Assembly --- # 7
68260151AA- Resonator and Pipe Assembly --- # 10

So with all that said , according to MOPAR , the rearward suitcases are the Resonators and the middle cylinders are the Mufflers .


Here are the links to the Mopar exhaust pages ;

Mopar Exhaust - 2015 Dodge Challenger - Exhaust | Mopar
Muffler and Resonator Assembly - Exhaust System, [ERB] - MUFFLER AND RESONATOR, Exhaust - 68260150AA | Mopar
Resonator and Pipe Assembly - Exhaust System, [ERB] - RESONATOR AND PIPE, Exhaust - 68260151AA | Mopar