...I have the V & H dresser duals with the V & H twin slash cut mufflers on my '13 EGC and I'm surprised how loud it isn't. Nice mellow tone.

 

Don't be to quick to go true duels do your research some duel setups kill your power I had Reinhardt true duels on my 06 and they killed the power also the left side pipe is in the way for any kind of work to be done on that side

 

...I have the V & H dresser duals with street cannon mufflers on my '13 uc
only loud if you want it to be.
I've been doing some auto tunes on it and it keeps getting better.

 

True duels take away low end power and torque. Do some research. V&H power duels or Rush High Output Duels (I have Rush, see picture, before heat shields were installed) are much better than true duels and sound great too. I went with Rush because it keeps the look of true duels with the crossover at the mount by the Trans. V&H crossover is much more obvious.

 

Maybe try rinehart 4" true duals?
They have a good deep sound but not as loud as there 3.5"