I need to get smogged in Cali by Feb. and i'm getting the p0420 code. I understand i need a new cat but factory is $600. Are there any alternatives that will pass Cali test? what are my cheapest (lol) choices?

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2004 Comp G

mine is doing the same.... luckily MI has no emission testing, thinking about just cutting it out. Side note, my dash is lovely with check engine light, ABS, and traction control lights on. Lots of yellow to look at.

any cat that has a carb oe number for cali should work. i would get a factory one though to garentee it works

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

How many miles are on your car? It could still be covered under warranty.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

usually the converters are covered to atleast 80,000.

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CobaltSS.net Moderator

last i checked most 97-03 are out of the extended emissions warrenty just do to age

i would double cheack at the dealer before assuming they will do it.

and the extended emissions warrenty was up to 100,000 miles

-- Sat Dec 17, 2011 10:07 pm --

last i checked most 97-03 are out of the extended emissions warrenty just do to age

i would double cheack at the dealer before assuming they will do it.

and the extended emissions warrenty was up to 100,000 miles

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

im at 105k. are the zzp downpipes cali legal? what about the pcm code delete?

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2004 Comp G

code delete would not pass a sniffer and they will now that the test has not run

the cats ZZP uses are magnaflow high flow catsnot sure if they have a carb number

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Well this is an 04-08 thread Tom haha. But yeah 105k is no go for warranty. I looked for some bolt in DP/Cats but all the ones I found were only 49 state legal. Damn CARB!!!

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

go headers w/ oem cat

wow that sounds ummmmmm reallly gewd???

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Even then I've heard from some friends in Cali that you can't even buy your own cats there anymore. You have to have them installed by a mechanic or muffler shop or done by a dealer. It's illegal to order them on your own and install them yourself anymore. It's really jacked up and another reason I will never live there.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

good thing i work for a dealership.....just not a GM dealership.....

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2004 Comp G

Might be cheaper for you to move..

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2009 Pontiac G8 GT- Roto-Fab Intake, Roto-Fab Radiator cover, Superchips Cortex Tune, Tinted Tail lights, Corsa Cat-Back Exhaust, Tinted side markers, Painted GXP Diffuser, Tinted Reflectors, Painted Grilles.

Magnaflow makes California CARB certified hi-flow cats, that's what I used two years ago and I passed with no problems.

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12.3 @ 108 w/ 1.7 60'

no go for cali

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

so if magnaflow uses CARB cats, then i should be able to get a zzp downpipe 3" 304SS bolt in w/cat and add the rear O2 extension. But when i look at magnaflow website, they only offer CARB cats for up to 03 GP. Am I fkt?

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2004 Comp G

You just get a universal cat that is not car specific (mine is 3" in and 3" out), yes you can get away with using a zzp DP and the universal cat. They won't even be able to tell as along as you have stock exhaust manifolds.

I get away with my headers (TOG's) because I have a CARB sticker that is really only good up to 2002 I believe, but they don't check at the place that I go to.

Your best bet is to order the cat from Jegs or Summit, I think that mine was $236 or something like that.
http://www.magnaflow.com/02catalytic_co ... RB/414.asp

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12.3 @ 108 w/ 1.7 60'

what size are the exhaust manifolds? is the 3" downpipe and cat overkill for stock manifolds?

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2004 Comp G

Did you try replacing the rear o2 sensor first to make sure its not just a bad sensor?

not yet.... was planning on doing that first but since my resonator is rotting, and i had the p0420, i would start piecing together an upgraded exhaust. I have also been thinking that since my hearing is going slowly, Id make my exhaust as quiet as possible so I would be able to hear crucial problems sooner.

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2004 Comp G

What size are the stock manifolds? Which zzp pipe matches? 2.5" or 3"? I am picking up O2 sensors tomorrow and if they dont work, ordering the 304ss bolt in w/ cat from zzp just not sure which size to go with the stock manifolds.

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2004 Comp G

if your car is supercharged go 3" if it's not 2.5"

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

picked up an O2 sensor today. went to install it and found it to be not the same as what i took out. I have a Delphi 12572772 for the rear O2. The parts guy at the gm dealer asked if the car had the motor replaced or something because his computer didnt show what i had. I gave him my old part number and he checked it out. gm replaced it with a different part number, which he ordered for me. will be in Monday. I hope it fixes the problem lol... the more i read about california and their stupid smog laws, im a little scared of what it will end up costing to fix the p0420. A factory downpipe is $550. a zzp costs $250 and is upgrade... im not quite sure which one to get. havent heard from anyone here in cali that has one.

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2004 Comp G

I would get the ZZP downpipe, I have TOG headers, and I was able to pass smog. The only thing that you really need is an ODBII cat.

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12.3 @ 108 w/ 1.7 60'

ok... so i am about to order the zzp downpipe. 3" SS bolt in w/cat. I will be getting the 3" exit on it as well. That said, I noticed my resonator was rotten and needs to be replaced. It measured around the 40" long. A magnaflow ss resonator is 3" in/out and 20" long. Would it help with noise to add a second resonator? 2 in line.... make it 40".. ?

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2004 Comp G