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The woven metal piece is a flex pipe. The one that looks like a resonator is actually a honeycomb cat that is some kind of a final "scrubber". My truck had this on it because it was a California truck & they have extremely high emissions requirement. If you live in a non compliant state then your "scrubber" may be blank (no honeycomb, no cat effect) & just being used to fill the space. You probably won't know for sure untill you look in it.
x2^^^^^^^^^^^^
 
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