Secondary cat / resonator delete - removed

[EONR24]

Not trying to be a jerk, but those welds look pretty awful...

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[Tom 71 Maverick 24]

People are wondering why the welding job was so poorly done.

Is it because it was done in a back alley in the dark by amateurs?

Reminds me of scenes from the movie "Dirty Dancing".

Probably because hiring a pro welder to weld an exhaust system is very expensive. Granted, this looks like something I'd do with my welding skills (near zero), but if you see what they're paying hourly for a good welder like the ones that do piping at a nuclear plant - well, that's insanely expensive.

Personally, I would probably not do this - at least not the way it was done. I'm seeing that cat-back exhausts instruct to cut just downstream from this cat, and are designed to keep it in service.

One might wonder, though, if taking a long drill bit and boring through that honeycomb material would significantly improve flow and potential HP. I mean, if it's for 3 or 4 HP, I'd say not worth it. If it's 20 hp though, well, I'd have to think about it.

You'd have to also weigh the effects it would have on actual emissions. If it's negligible versus significant. And whether they actually test the exhaust output or just pull data from the computer like they used to do here (before the program was finally ended in my county). Keeping in mind that all the sensors and such are upstream, so the computer doesn't even 'see' this secondary cat. But all that's between me and the regulators, stealthy changes are the way to go IMHO.

 

[rlhdweman]

Modern cats don't restrict exhaust flow like the one's from the old days, no need to remove them. This summer I put one on my 1964 Cadillac, now the garage doesn't stink for hours from driving in & out of it & the vehicles behind me don't have to choke on smelly exhaust & the car runs fine, my 73 is getting them next year.

 

[ejgroth2620]

Just dropped my 2024 xl awd off to get the secondary cat deleted. This is the first of many upgrades. Fingers crossed it gives it some sort of sound.

First impressions:

Just got it back. Very slight change in sound,especially from inside. The engine is still louder than the engine. What I did notice as soon as I drove it was a way better throttle response and less lag. I'm satisfied with the results of this $150 upgrade. I will post the sound clip later when my friend gets out of work.

Secondary cat delete and cat that was removed.

Does this part have any value to a thief? I've wondered if I needed a cat shield to protect mine from a crook, but maybe it has so little value it's not worth the cost and effort.

 

[RonaldRampage]

Does this part have any value to a thief? I've wondered if I needed a cat shield to protect mine from a crook, but maybe it has so little value it's not worth the cost and effort.

Not to sure of the value but its very easily accessible and could be cut out in minute's.

 

[Baloo]

More than just your joking about being a "polluter", it is my understanding that both you and the shop are guilty of federal felonies. Am I correct? Not sure I would post this .

Ha

 

[Baloo]

Will not pass visual emissions inspection anywhere…good luck with that! Warranty voided, too. May set off CEL. Dum dum dum…

What if the vehicle registered in a non-nanny state? It only would then need to meet the requirements of the state the vehicle is registered in.

Just like window tint or any other requirements thanks to the compact between the individual states, one is only required to meet the state of registration requirements.

Some states require front plates, some allow darker window tint than others, some require inspections. No worries if y ou register the vehicle in a non-nanny state.

 

[RonaldRampage]

This guy is a real Boy Genius.

You can tell from his posts and what he does to his truck.

You drive a hybrid. Lol

 

[FHFR3Maverick]

On a side note, I was looking at my exhaust system and saw this vent near the tailpipe. Any ideas on what it is for? never seen anything like it in 50 years of working on vehicles!

 

[BeardedMarine]

Modern cats don't restrict exhaust flow like the one's from the old days, no need to remove them. This summer I put one on my 1964 Cadillac, now the garage doesn't stink for hours from driving in & out of it & the vehicles behind me don't have to choke on smelly exhaust & the car runs fine, my 73 is getting them next year.

Was there a reason to put a converter on a 1964 Cadillac?

 

[EONR24]

This is the SECONDARY Catalytic Converter. The MAIN Catalytic Converter is in the downpipe right after the turbo, and it filters the majority of impurities in the exhaust system before the gases even reach the secondary converter. The MAIN CAT has O2 sensors attached and would likely throw codes if replaced with a cat-less downpipe. The Secondary CAT does not filter much at all. Just letting everyone know that is screaming "Pollution!" and "this won't pass emissions".

 

[RonaldRampage]

On a side note, I was looking at my exhaust system and saw this vent near the tailpipe. Any ideas on what it is for? never seen anything like it in 50 years of working on vehicles!

99% sure that's a resonator

 

[RonaldRampage]

This is the SECONDARY Catalytic Converter. The MAIN Catalytic Converter is in the downpipe right after the turbo, and it filters the majority of impurities in the exhaust system before the gases even reach the secondary converter. The MAIN CAT has O2 sensors attached and would likely throw codes if replaced with a cat-less downpipe. The Secondary CAT does not filter much at. Just letting everyone know that is screaming "Pollution!" and "this won't pass emissions".

I just went to the place I get my sticker from and they said the same thing as you. This will pass! Thanks! Glad I'm not in California or other states like Cali.

On a side note, I was looking at my exhaust system and saw this vent near the tailpipe. Any ideas on what it is for? never seen anything like it in 50 years of working on vehicles!

 

[JON1911]

Just dropped my 2024 xl awd off to get the secondary cat deleted. This is the first of many upgrades. Fingers crossed it gives it some sort of sound.

First impressions:

Just got it back. Very slight change in sound,especially from inside. The engine is still louder than the engine. What I did notice as soon as I drove it was a way better throttle response and less lag. I'm satisfied with the results of this $150 upgrade. I will post the sound clip later when my friend gets out of work.

Secondary cat delete and cat that was removed.

You just posted that you broke FED. law.

 

[RonaldRampage]

You just posted that you broke FED. law.

Good lol I obviously don't care and you're wrong

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