Catalytic Converter Calif Emissions

frwgt350net · Feb 28, 2026

I need to replace the catalytic converters on my 1986 Mustang.

Would this be the correct replacement unit I need Ebay Link

And do I need to add this little tubing back in place - to pass emissions test. I assume I do. Do I just make a small hole in each cat and weld this back in place.

General karthief · Feb 28, 2026

Two different types of Cats, being in Cali you need to find the rules in your county that are specific to exhaust modifications concerning Cats.

nickyb · Feb 28, 2026

My BBK catted mid pipe has cats like the ones shown,but its pricey$$$

gkomo · Feb 28, 2026

The SMOG guy I went to said if you’re replacing cats they need to be CARB legal, not just ‘emissions’ legal. He also recommended a SMOG shop buy and put them in so everything is logged and correct (didn’t have a salesy undertone to it).

Due to the uncertainty I ponied up for the CARB legal Magnaflow xpipe.

Noobz347 · Feb 28, 2026

Links?

Mustang5L5 · Mar 1, 2026

Being in Cali, you are going to either find a stock H-pipe that somebody has, or pony up for this

https://www.summitracing.com/parts/mpe-337338?seid=srese1&gclid=EAIaIQobChMI5Z6HwZL_kgMVOFBHAR2GdCSdEAQYAiABEgKY6PD_BwE

gkomo · Mar 1, 2026

That’s the one I have. Does come with a 5 year emissions warranty.

I’m curious how my oil burning issue is affecting it though.

General karthief · Mar 1, 2026

Oil burning is not good for Cats, and it likely will not pass emissions anyway.

gkomo · Mar 1, 2026

I did just have the car pass smog like a month ago. I just changed the plug right before. Runs ‘fine’ with a fresh plug in it.

nickyb · Mar 1, 2026

If I had to pass Cali. Emissions I would put stock h pipe with cats for inspection then remove it till next inspection.

frwgt350net · Mar 2, 2026

nickyb said:
If I had to pass Cali. Emissions I would put stock h pipe with cats for inspection then remove it till next inspection.

I think I'll take that advise - - - - -

frwgt350net · Mar 2, 2026

gkomo said:
I did just have the car pass smog like a month ago. I just changed the plug right before. Runs ‘fine’ with a fresh plug in it.

Thank you kindly - - - -

frwgt350net · Mar 2, 2026

General karthief said:
Two different types of Cats, being in Cali you need to find the rules in your county that are specific to exhaust modifications concerning Cats.

Thank you kindly - - - -

frwgt350net · Mar 2, 2026

gkomo said:
The SMOG guy I went to said if you’re replacing cats they need to be CARB legal, not just ‘emissions’ legal. He also recommended a SMOG shop buy and put them in so everything is logged and correct (didn’t have a salesy undertone to it).

Due to the uncertainty I ponied up for the CARB legal Magnaflow xpipe.

Thank you for that information - - I didn't know there were different types of converters

Catalytic Converter Calif Emissions

frwgt350net

Member

General karthief

wonder how much it would cost to ship you a pair

nickyb

I gotta say i never painted my nuts, Never Ever

gkomo

now i can hopefully expect to receive the shaft

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Mustang5L5

That is…until I whipped out my Bissell

gkomo

now i can hopefully expect to receive the shaft

General karthief

wonder how much it would cost to ship you a pair

gkomo

now i can hopefully expect to receive the shaft

nickyb

I gotta say i never painted my nuts, Never Ever

frwgt350net

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frwgt350net

Member

frwgt350net

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frwgt350net

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Catalytic Converter Calif Emissions

Member

wonder how much it would cost to ship you a pair

I gotta say i never painted my nuts, Never Ever

now i can hopefully expect to receive the shaft

Stangnet Facilities Maint Tech... Er... Janitor

That is…until I whipped out my Bissell

now i can hopefully expect to receive the shaft

wonder how much it would cost to ship you a pair

now i can hopefully expect to receive the shaft

I gotta say i never painted my nuts, Never Ever

Member

Member

Member

Member

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