Is there any reason to get swap out the stock resonator for the mid-high? If anyone did was there any difference?
The stock resonator is a dual chamber which helps with the higher rpms. The single chamber is better for the low and may be a little louder.
I have a THS and low end power increased a bit with a little sacrifice at high.
The Super Derecho
There would be no point in upgrading to the high end resonator, you would be better off putting the money into an aftermarket pipe.