What is this part on the cat/downpipe

[fatmonk8]

This "muffler"? Is rattling. But I can't figure out what this part of the downpipe is. I know the two cats are above it. I can't seem to find a diagram stating what it is.

Is it another muffler? Or a resonator?

 

[B-train]

I think that's the big, stainless, flex joint thar bolts to the ball flange. I don't think it's replaceable.

 

[blondie70]

I was told by a muffler guy that it's another cat.

 

[Jeff_]

The California Cat is what that's known as. Useless 3rd cat for California emissions crap.

 

[Thrust]

Yes its a third cat like @Jeff_ said.
Maybe clean it out to stop it rattling.

 

[Rygrego]

This "muffler"? Is rattling. But I can't figure out what this part of the downpipe is. I know the two cats are above it. I can't seem to find a diagram stating what it is.

Is it another muffler? Or a resonator?


View attachment 431235

Downstream Catalytic converter. If it's rattling it's done and must be replaced.

 

[buckwild27]

If you're not in California I would cut it off and put a pipe in it’s place.

 

[fatmonk8]

If you're not in California I would cut it off and put a pipe in it’s place.

I'm in PA, we are CARB compliant unfortunately.

 

[fatmonk8]

I think that's the big, stainless, flex joint thar bolts to the ball flange. I don't think it's replaceable.

No, that's right before the muffler. Others say it's a third cat.

 

[fatmonk8]

Downstream Catalytic converter. If it's rattling it's done and must be replaced.

That's what I was assuming.