What is this part on the cat/downpipe

fatmonk8 · Jun 26, 2024

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 · Jun 26, 2024

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

blondie70 · Jun 26, 2024

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

Jeff_ · Jun 26, 2024

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

Thrust · Jun 26, 2024

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

Rygrego · Jun 27, 2024

fatmonk8 said:
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 · Jun 27, 2024

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

fatmonk8 · Jun 27, 2024

buckwild27 said:
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 · Jun 27, 2024

B-train said:
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 · Jun 27, 2024

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

That's what I was assuming.

What is this part on the cat/downpipe

fatmonk8

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B-train

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blondie70

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Jeff_

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Thrust

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fatmonk8

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