A resonator is designed vehicle specific, to eliminate those odd random rpm drones and rasps.

 

Yes it does get a deeper sound and isn't to bad through the rpm range as far as drone goes. As far as emissions I don't believe this affects it at all. Ford didn't run resonators until 2011. Not the same as deleting a cat.

 

So the 2009 models don't have a resonator?

 

Nope. Not as far as I know. Just take a look under your truck. It sits right before your muffler.

 

Ha... you said "Beaver"

 

So basically a resonator is a baffle for drone?

 

Exactly