Don’t know if this helps as my experience is with the euro system exhaust but you never know.
It was easy to identify the large ones on top of the cats but there are others before the cats around the O2 sensor. These are spot welded on but on mine the welds has rotted away. Real annoying little rattle at a certain rev / resonance.
I cut them off when I had the cats out which is another story. Hasn’t had any effect on anything that I can tell and passed the emmisons test with excellent results.
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