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Help: CA Smog Test & Aftermarket Exhaust/Intake

 
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Old 06-14-2014, 02:35 AM
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Help: CA Smog Test & Aftermarket Exhaust/Intake

I got a 5th Gen ('99) and I live in California. This is the first time I've ever had to do a smog test so I've been looking into it, but am still unclear on some things. I already know I'll fail a smog test because I have a couple exhaust leaks right after the cat, right where the rear O2 sensor is. The Rear O2 sensor is also bad and is tripping the CEL. The cheapest place I've been quoted on to replace the cat & O2 sensor is around $400. For that much, I can get a cat-back system + Header + cat + O2 sensor that is all bolt on, and do it my self. Of course for that amount of money we're not talking about premium name brand stuff, but I can live with that.

I know that the cat has to be specifically CARB compliant, but what about headers, muffler, and the rest of the exhaust system? Will having aftermarket cause me to fail, even if its able to pass the sniffer test (which as far as I understand is completely dependent on the cat)?

Here's the headers/cat-back system, I'm thinking of getting. The cat is a Magnaflow, and I know that will work, so not an issue there.

Headers
cat-back system

[Edit]
after some more research and debating, I'm now leaning more towards This cat-back system.

Thanks.

Last edited by HiGhGuY; 06-14-2014 at 11:49 AM.
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Old 06-14-2014, 03:21 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

exhaust leaks are pretty easy to repair and dont cheap on with cat and o2 sensor. if you do so youre asking for troubles

in cali you need carb legal exhaust/parts. and you dont gain anything from those megan/dc/ebay headers - they are so close to stock so forget them anyway.

and see that cheap ebay crap usually is just cheap crap

so if you want something "upgrades" done to your car just buy some brand catback and change your air filter to something better (k&n) - then you have no problems with inspectations
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Old 06-14-2014, 11:58 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

So basically, if I put on a cat-back system and headers (low or high end) and go to get a smog check, I'm screwed?

As I said, the cat is not at issue here. I'm getting a Magnaflow. I've read several reviews of Californians, and most everyone of them has said that they have passed smog with it.

as for the cat-back, I'm now leaning towards a Yonaka (see edited OP). It has also has overwhelmingly positive reviews. Also it claims (and I've heard in videos/sound clips) that it doesn't have the drone/raspy sound.

BTW... what brand headers would you suggest for a descent increase in performance?

Luckily all of this is bolt on, so I can always install it after the smog test, then switch back to stock for a day ever other year . "the man"
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Old 06-15-2014, 04:31 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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So basically, if I put on a cat-back system and headers (low or high end) and go to get a smog check, I'm screwed?
yeah true "race" headers (which give you gains) doesnt have licenses in cali

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as for the cat-back, I'm now leaning towards a Yonaka (see edited OP). It has also has overwhelmingly positive reviews.
and is it carb legal?

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BTW... what brand headers would you suggest for a descent increase in performance?
none of ebay/dc/megan etc

and you cannot really install any "race" headers there because they doesnt line up with your stock exhaust - you have to modify your catback if you use them.

so if you really want gains from your exhaust you have to change the stock one back there for inspectations every time
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Old 06-15-2014, 12:18 PM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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and is it carb legal?
I don't know. I have looked at several different cat back systems from the $100 ebay ones to very expensive ones, that I cannot afford. I haven't seen any that specifically say they are legal for California.

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so if you really want gains from your exhaust you have to change the stock one back there for inspectations every time
I don't have a problem with that at all, as long as it's all bolt on. Would need to be done once every two years, and doesn't really take that long unbolt/re-bolt the exhaust system.
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Old 06-15-2014, 12:35 PM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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to very expensive ones, that I cannot afford.
then save some money. dont buy cheap crap which rusts in a year so you have to buy the more expensive one anyway

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I haven't seen any that specifically say they are legal for California.
so they probably arent

of course full custom setup is always best


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I don't have a problem with that at all, as long as it's all bolt on. Would need to be done once every two years, and doesn't really take that long unbolt/re-bolt the exhaust system.
"race" headers arent really "bolt on". you have to modify them to fit to rest of your exhaust (or modify your exhaust to fit them). and you probably have to take those headers off from below so you have to take crossmember off and so on...

so you have to have then 2 different exhaust systems

and cops can give you a ticket (or can they take your car away?) if they want to see your engine bay and you have something "illegal" there...
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Old 06-15-2014, 01:03 PM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

I'm also in Cali and had the same issue with the exhaust in my 4th gen. I had problems from a cracked stock header to rusted out pipes and a bad O2 sensor. I went with a megan header and generic piping with a carb legal cat. Passed with flying colors. If all you want is to be legal that would be the way to go. Finding a performance exhaust system to pass our smog laws is difficult and expensive. The system I installed is now 2 years old and is still doing the job it needs to.
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Old 06-15-2014, 01:20 PM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

is universal cats even legal there?

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Finding a performance exhaust system to pass our smog laws is difficult and expensive.
yeah cant really talk about performance with those 60mm catbacks..
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Old 06-15-2014, 02:24 PM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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is universal cats even legal there?



yeah cant really talk about performance with those 60mm catbacks..
Universal cats will not pass inspection. A stock replacement is necessary, which isn't hard to get done. Any muffler shop can fit one in an aftermarket exhaust setup.

Performance rarely coincides with our smog laws.
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Old 06-16-2014, 01:06 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

Jimmyznutz, so you got an OEM Honda prelude cat? Did you have to get it through a Honda dealership? how much did it cost? and was it direct fit (bolt on) or did it have to be welded on?


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is universal cats even legal there?
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Originally Posted by jimmyznutz View Post
Universal cats will not pass inspection. A stock replacement is necessary, which isn't hard to get done.
Universal Cats ARE legal in California, provided they're CARB approved or "50 state" approved and furthermore has been approved for use in your specific vehicle. This is determined by having the correct Executive Order Number (EON), which is stamped into the cat itself, that coincides with your vehicles Engine Family Number (EFN), which is usually found on a sticker on the under side of your hood.

For example, my car (99 lude base) has the EFN: XHNXV02.2SA1 and the cat I'll be getting is a magnaflow universal cat with the executive order number: D-193-112. This cat, or any cat with this executive order number is pre approved to be used on any car with the above listed EFN, but not necessarily only that EFN.
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Old 06-16-2014, 01:26 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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Jimmyznutz, so you got an OEM Honda prelude cat? Did you have to get it through a Honda dealership? how much did it cost? and was it direct fit (bolt on) or did it have to be welded on?
Not a Honda dealership unit, but yes a direct bolt on oem spec unit. Welded on cats do not pass the visual inspection and will be seen. Unless of course you know someone in business that overlooks some things. Any STAR certified smog center will not pass an aftermarket welded cat.
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Old 06-16-2014, 03:49 AM
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Re: Help: CA Smog Test & Aftermarket Exhaust/Intake

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Not a Honda dealership unit, but yes a direct bolt on oem spec unit.
magnaflow atleast have ones
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