I've got a 93 EB 5.0 that has two cats, my question is if I only run one cat will I still pass smog In california? Any one i cali tried this?
Evan III
Officially, No.
Cali CARB rules state that you may not change the number of cats or the size of the pipe or change from a single to a dual. All cats must meet CARB certification.
After the Cat you can do anything you wish as long as it meets Fed rules and local noise rules.
Your pre OBD-II vehicle can use any cat, header or pipe tested and certified for your specific engine.
"It is, also, legal to install an OBD II compliant aftermarket catalytic
converter or header on non-OBD II equipped vehicle provided that the engine
displacement and equivalent test weight (ETW) of the non-OBD II vehicle
do not exceed those of the vehicle model with the highest engine
displacement and ETW of the vehicles listed under the Executive Order
(EO) for the particular catalytic converter or header model."
For example, if your 1993 Ford truck has engine displacement of 5.0L and
a test weight of 5000 lbs., you can install an OBD II compliant after
catalytic converter exempted for Ford trucks on the vehicle, if one of
the trucks listed under the particular EO has an engine displacement of
5.0L or greater and an equivalent test weight of 5000 lbs. or higher.
You can roughly estimate the ETW of a vehicle by the following formula:
ETW = Curb Weight + 1/2(GVWR-Curb Weight).
As, Redwagon said, if your tester doesn't do a thorough job you may pass. But, if he sees a lot of shiney new parts and decides to take a closer look. You could be off to see the arbitrator.:box0715:
My advice is buy only CARB certified parts with sticker to prove it.
On a different note.
I heard of a guy that welded flanges to his cats. When he had to smog he unbolted the straight pipe between his first cat and muffler, and bolted in his second cat.:goodfinge Hope you find the above information helpful.
re: cat
the vehicle came with 2 cats.if you took off the precat, i, as a smog tech will pick up on that in a heart beat and would be forced to fail it under "missing"/or "modified" cat conv.
dont get me wrong, i do not want to fail a fellow wheelers truck, but the punishment is extreme if i let it slide.
i would recommend you replace the main cat, and leave the precat alone. smog it, and then _______________ for 2 years. just keep the OE stuff for smog purposes.
you can email me if you would like to talk about it.
good luck
the vehicle came with 2 cats.if you took off the precat, i, as a smog tech will pick up on that in a heart beat and would be forced to fail it under "missing"/or "modified" cat conv.
dont get me wrong, i do not want to fail a fellow wheelers truck, but the punishment is extreme if i let it slide.
i would recommend you replace the main cat, and leave the precat alone. smog it, and then _______________
for 2 years. just keep the OE stuff for smog purposes.you can email me if you would like to talk about it.
good luck
re: cat
evan-
when i get to the shop tuesday morning, i will check what my reference book says in comparison to your emission label under your hood. the label always supersceeds the book. if you remove the precat, it can pass exhaust emissions, but will fail visual. check the thread tues morning.
any modification has to have CARB EO#_____ in order to comply. removing the precat and cat, and installing 1 high flow cat DOES NOT qualify. the precat HAS to be there unless under the EO it states otherwise.
evan-
when i get to the shop tuesday morning, i will check what my reference book says in comparison to your emission label under your hood. the label always supersceeds the book. if you remove the precat, it can pass exhaust emissions, but will fail visual. check the thread tues morning.
any modification has to have CARB EO#_____ in order to comply. removing the precat and cat, and installing 1 high flow cat DOES NOT qualify. the precat HAS to be there unless under the EO it states otherwise.
Well here's why I ask, Guess I should have put this in to begin with. first to save money, second because I want to redo te whole exhaust and was wondering about preformance. Can anyone recommend a bolt on kit or part #'s including cats that have worked well for you. affordablity is important.
cat
what are you trying to gain? power? a simple cat replacement wont do that. if you want a noticable increase, its gonna take intake, throttle body, headers, then exhaust, such as a high flow cat.(im not a believer in high flow cats btw) the truck weighs a lot, the hassle of emissions vs the power increase doesnt make it worth it. for under $200 you can have a cat installed, just leave the precat alone, even if its hollowed out, the main cat will do enough by itself.
what are you trying to gain? power? a simple cat replacement wont do that. if you want a noticable increase, its gonna take intake, throttle body, headers, then exhaust, such as a high flow cat.(im not a believer in high flow cats btw) the truck weighs a lot, the hassle of emissions vs the power increase doesnt make it worth it. for under $200 you can have a cat installed, just leave the precat alone, even if its hollowed out, the main cat will do enough by itself.
I'm talking about gaining power, I didn't expect to gain power by leaving out one cat, I expected my wallet to gain power by not buying one cat if I didn't need it. As far as power I'm planning on replaceing everything Cat to exhaust including (probly) 2 1/2" pipe? What diam. pipe would be best for a mostly stock 5.0? I'm thinkin magnaflow exhaust, but I don't know much about cats, so any help would be great.
i called the local muffler shop and they will cut out the 2 cats and put in a high flow one. They wont do anything illegal either, so i trust them on this. I want one just because i probably have clogged(original cats) so i probably might feel a tiny bit of power, and more importantly it will complete my sound system to sound extremely mean.
Stay away from kits. It's cheaper to buy individual parts. There are a number of threads with lots of opinions, but you'll have to decide.
Unless you change your exhaust manifolds to headers, having bigger pipes and high flow cats and muffler, will gain you nothing except better sound.
Based on the email I got from CARB, which I quoted in my prior post, you can pick any component either OBD-I or OBD-II certified for any year 5.0L or 5.8L bronco. And, anything goes after the cat.
Just curious, but what if I wanted to change to a dual exhaust system on my 86 5.0 EFI? Is it legal and would you have to have CATS on both sides just after the headers?
Thanks
:enforce
Thanks
:enforce
PaperOrPlastic, did you get my PM? If not, where in Livermore are you, I need a smog soon.
On a different note, I have no muffler as of right now, I have a turndown after the 2nd cat. Is there a short probe you can use or do I have to find a longer length of pipe?
On a different note, I have no muffler as of right now, I have a turndown after the 2nd cat. Is there a short probe you can use or do I have to find a longer length of pipe?
I'm not sure where you got your information, but this is a copy of an email I received from Carb.
"
From: rcastro@arb.ca.gov
It's legal for you to repair your exhaust system, but it's not legal to do things such as change exhaust tubing diameters before the catalytic converter(s), or add cross-over pipes where there were none before, or convert the vehicle to dual exhaust when it was not originally equipped with dual exhaust."
I don't know who is right. That's why I asked. I would hate to see someone install a true dual system, and then have to take it out.
Bonzia;
Let me know how this turns out because i'm only over the altimont and if they do good work or not good work, i would like to know.
Thanks
Rich
Let me know how this turns out because i'm only over the altimont and if they do good work or not good work, i would like to know.
Thanks
Rich
yea, definitely. I'm about to come upon some money, so i think ill be ready to get the cat done.
I know this is a long ways away but i had a cat back done in Redding Ca.
Cool older dude named Eddie own's the minute muffler shop 530-221-7765. He gave me the best price in town and was way cool.
3 inch pipe and a flowmaster muffler installed with a nice crome slash cut tip for 225.86
I asked him to look at my cat, when he removed the pipe to the rear of the cat he called me over and showed me the rear of the cat.
It looked very good and I did not want to spend any more so I did not get a price.
He explained to me that the screen looked good and that it did not rattel when he shook it little pieces break off and lay in the bottom. Mine had no rattel.
The old muffeler was trash and the flowmaster 3 inch is the sound I wanted not to loud but a nice rumble. http://www.fullsizebronco.com/forum/images/smilies/rockon.gif
:rockon
Cool older dude named Eddie own's the minute muffler shop 530-221-7765. He gave me the best price in town and was way cool.
3 inch pipe and a flowmaster muffler installed with a nice crome slash cut tip for 225.86
I asked him to look at my cat, when he removed the pipe to the rear of the cat he called me over and showed me the rear of the cat.
It looked very good and I did not want to spend any more so I did not get a price.
He explained to me that the screen looked good and that it did not rattel when he shook it little pieces break off and lay in the bottom. Mine had no rattel.
The old muffeler was trash and the flowmaster 3 inch is the sound I wanted not to loud but a nice rumble. http://www.fullsizebronco.com/forum/images/smilies/rockon.gif
:rockon
As with anything, shop around for a good place. Tell them your situation and find one who talks similar things back. I was able to find a really good smog/muffler shop this way.
It never hurts to ask.
It never hurts to ask.
We did the high flow cats and it didn't really make that much difference in HP..
Now no cats.. That's the power gainer.. Yea yea yea, so I'm poluting the environment, but it sees maybe 8 miles a week.. It sees less miles then people do in OHV parks in a day.
Now no cats.. That's the power gainer..
Yea yea yea, so I'm poluting the environment, but it sees maybe 8 miles a week.. It sees less miles then people do in OHV parks in a day. 
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
