Mesh on the outside and ribbed flexible screen/piping on the inside which I think is the pro for strength and durability. Will welding be easy? will have to wait. Overall I would say 5/5 for an overall product. The only question I can ask is if this 3" x 4" is long enough for enough exhaust flex compared to a slightly longer one, but I wanted a smaller profile, which is exactly what it offers.
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