I see the Boig Quietpipes available; I really wish they came in stainless. Has anyone tried installing a short muffler in the J-pipe that connects the shorty manifolds to the side pipes? FFR offers those pipes with cats in them, and I'm sure cats would help a bit with the sound, but for those who don't need/want cats, is there a muffler that would fit in the same location? Ideally available in SS?