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Posted

I have a 2015 Sierra 2500hd 6.0L. I have a rattle in the rear past the 2 catalytic converters and before the muffler. I’m curious if it is a 3rd catalytic converter?? It’s the red circle in the pic.63246866-06A8-4A8B-A2AA-A0ED99780AF1.thumb.jpeg.ceeb33b5b4514abaeac153ed9884305a.jpeg

Posted
1 hour ago, Mcheil83 said:

I have a 2015 Sierra 2500hd 6.0L. I have a rattle in the rear past the 2 catalytic converters and before the muffler. I’m curious if it is a 3rd catalytic converter?? It’s the red circle in the pic.63246866-06A8-4A8B-A2AA-A0ED99780AF1.thumb.jpeg.ceeb33b5b4514abaeac153ed9884305a.jpeg

 

 

 

Yes.  2 primaries and one secondary make up the Y pipe.  

Posted

Ok thank you very much I appreciate it.  I think I did find the part I’ll have to remove everything an weld this part oneED6D0BAF-607E-44BF-8001-9E77853E2E58.thumb.png.b45a4622c400498f2352afab372e38e0.png

Posted

Honestly you don't need the 3rd cat unless you live in California, the 3rd cat is not monitored at all and could be removed without issue.

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