What is this part on the cat/downpipe

fatmonk8 · Jun 27, 2024

I just went ahead and bought the Walker Ultra EPA 50497 for a replacement.

It's not CARB compliant technically, but it looks the same and says it will fit. I just can't fathom spending 2k-3k for one that looks exactly the same and will probably perform the same just because it's not CARB compliant.

Just hopefully my emissions shop doesn't check for a CARB #

buckwild27 · Jun 27, 2024

fatmonk8 said:
I'm in PA, we are CARB compliant unfortunately.

You will still pass i think. There's no 02 sensors on it. It's just a restriction. A lot of people just call it the California 3rd cat.

fatmonk8 · Jun 28, 2024

buckwild27 said:
You will still pass i think. There's no 02 sensors on it. It's just a restriction. A lot of people just call it the California 3rd cat.

I actually thought the same thing, that's actually why I asked the forum. I was confused why there would be a cat after the sensors, so I thought maybe it's something else like a muffler or something.

But if I remove it, and I'm in a CARB state, won't that fail regardless because it's missing?

buckwild27 · Jun 28, 2024

fatmonk8 said:
I actually thought the same thing, that's actually why I asked the forum. I was confused why there would be a cat after the sensors, so I thought maybe it's something else like a muffler or something.

But if I remove it, and I'm in a CARB state, won't that fail regardless because it's missing?

I can’t 100% answer that because I'm in ohio and don't have to deal with it. I would think that PA is not as strict as California.

fatmonk8 · Jun 28, 2024

buckwild27 said:
I can’t 100% answer that because I'm in ohio and don't have to deal with it. I would think that PA is not as strict as California.

Yeah, maybe I'll look into it. Maybe I can just have it removed. But I know since my car is newer then 2008 I'm not exempt from the rule. I guess worse case is at that point I just replaced them anyways.

buckwild27 · Jun 28, 2024

fatmonk8 said:
Yeah, maybe I'll look into it. Maybe I can just have it removed. But I know since my car is newer then 2008 I'm not exempt from the rule. I guess worse case is at that point I just replaced them anyways.

That is true. Good luck! Let us know how it goes.

fatmonk8 · Jun 28, 2024

buckwild27 said:
That is true. Good luck! Let us know how it goes.

Thanks!

tom3 · Jun 28, 2024

Before spending $2 - 3000 on it I'd neatly gut it and see how it goes through inspection. I doubt they would see any problems with the exhaust, especially if you run it on the highway at speed for some miles before testing.

fatmonk8 · Jun 28, 2024

tom3 said:
Before spending $2 - 3000 on it I'd neatly gut it and see how it goes through inspection. I doubt they would see any problems with the exhaust, especially if you run it on the highway at speed for some miles before testing.

That's a good idea. I may try that out.

fatmonk8 · Jun 30, 2024

Cat gutted, also replaced exhaust with a cat back system. No more rattling. Guess we will see if it fails emissions next time I go in.

What is this part on the cat/downpipe

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