Both the resonators on the x pipe and the mufflers themselves are perforated pipe with some sort of packing on the backside. Essentially a glasspack or magnaflow. I don't know what the fiber packing is actually made from.
This is obviously a low restriction design since it's a straight tube. The question is whether or not it sounds like a straight pipe or not.
The tig welds are good, but not "artistically beautiful." It's tough to make an ugly tig weld anyway - but if you've done any welding, working the pool with skill makes very even swirls. These are good - not great. Not done by a 50 year old craftsman.
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