Exhaust system.
The resonator is part of the exhaust system. Your model does not have one. You only have the exhaust system.
The resonator is a sound cancelling system where the engines exhaust frequency is greatly reduced as the sound waves bounce into each other. Its a pretty simple system, where as the low pressure waves bounce off the back of the resonator into the incoming high pressure waves, therefore, cancelling each other out.
All the exhaust systems have a type of resonator at the end of the exhaust system. It's normally a larger round area where your water regulator is. In the newer models, they actually designed a "resonator" for the applications.