Hooker True Dual Exhaust

Has anyone purchased and installed the "Optional muffler cartridge" for the Tuned Flow exhaust?
I copied this paragraph from the Web site "Optional muffler cartridge create a more mellow sound while increasing low end performance.
Straight tuning cores offer fine tuning of pipes without sound control by creating a 3rd step and changing primary length."

I am curious how they perform in a stage 1 bagger application. I have been playing with the adjustment going from max torque setting to half way in between max torque and max HP. I have reviewed a dyno run with this system in which they run a torque and HP evaluation between these two settings. It seems that this muffler produces quite a bit more torque and does not really lose any significant HP until you reach above 4500 RPMs. with the max torque setting (most quiet) I dont run my bike that high an RPM anyway!

I guess If the max torque setting is producing very good torque and HP
acroos the lower and mid rpm range, how much improvement would this quieter core baffle produce?

Mike