The resonator is important as others have said, it is usually specified (tuned) to eliminate specific resonances in the system which may cause a loud "droning" at a certain engine rpm and specific highway speeds.
It's like tuning and Organ pipe or the box resonance in a ported loudspeaker but to reverse effect: mitigation.
Dr. Hemholtz, a brilliant polymath from the mid 19th century, was a pioneer in this area of acoustics and auditory perception which eventually crossed over into electronic circuits decades later.
My question to you is, do you have a rusted or damaged resonator on the Camry? Just wondering why the general query.
By the by, I ain't so smart ! My Highschool Science teacher - Mr. Wilkinson - made us learn just a bit about each person behind the science. Somehow I remember this - and I don't have a good memory!
Amps - Andre-Marie Ampere
Watts - James Watt
Ohms - Georg Ohm - looks like Beethoven !
Volts - Alessandro Volta
Torr - Evangelista Torricelli
Joule - James Joule - Our teacher pronounced his name Jowl
and ... a couple more that I do now forget !
- Ken