Thankfully the only thing that's standard is the back box. Larini bypass cats and X-pipe, and then sport-mode opens up the valves, so pretty beefy. I just wonder whether I'd prefer a different back box to give a bit more scream.
That should sound great. Mine has decat manifolds then Larini sports cats, Larini h-pipe and Larini valved rear boxes. The x-pipe and h-pipe make a very different sound; x-pipe is higher pitched, h-pipe is deeper.