As I run Barrett I can't help with the question but some advice FWIW....

Think long and hard about if you definitely want a twin system before outlaying nearly twice as much over a single. I wanted the twin for symmetry and to keep it true but realised afterwards the factory system isn't twin, just a single with two holes in the muffler. I later dropped a can and enabled me to do what most do and fit an really useful tool tube.

One thing I love about the Tenner is the tucked exhaust and that panniers are not offset due to a huge can hanging off one side...best of both worlds, tucked, symmetrical and tool Storage.

Matt