Has anyone seen an ad for a true dual system for the armada?

The only thing close is the borla dual outlet, but I am looking for a true dual or has anyone done any custom work to their exhaust.

I don't think there is a true dual system on the market. You would need to have a muffler shop build the system.
You will lose significant low end torque if you run a true dual system on the Armada. This is probably why you don't see the system on the market.