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Today I took my CaymanS (w. Capristo exhaust and cats) to do the smog test, but failed. When dealer returned the car back to me, "check engine" light was on.
I've searched few hours, but still have no idea how to do with it.
Is there any chance to get it pass without returning to stock?
:thanks: :thanks:
 

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You have no choice but to return to stock. Your car should have failed more than the tailpipe test; part of the inspection is visual, the tech that tested your vehicle had no idea what he was doing. He should have failed your vehicle for not having CA approved OBDII cats and for having the pre cats missing. Overall, your vehicle should have failed as tampered.

Tim
 

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The Capristo has pre-cats in the headers but drops the larger ones in the mufflers like most cat backs do.

No current experience with the CA smog test but there was another thread dealing with passing previously. Might be able to search it and get some tips. Other than nothing to be done with failing on the visual the one functional thing I remember from it is thorough warm up.
 

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I have the Remus race exhaust which deletes the secondary cats and passed CA emissions. The trick is to get the main , cats as hot as possible so they are working at peek efficiency. I failed the first time, and at the recommendation of the shop, went out and drove the car hard for 15 minutes, returned, re-tested and passed. You might also try this in conjunction on of the emission reducer fuel additives you can pick up at pep boys, etc.. Good luck!
 

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The recommendation I received straight from the experts at Borla is, as others have mentioned here, to make sure the cats are hot when you take the car in to test. The purpose of the secondary cats (which are usually removed when an aftermarket exhaust is installed) is to 'clean up' emissions missed by the primary cats when they're cold (and at their least efficient).
 

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Today I took my CaymanS (w. Capristo exhaust and cats) to do the smog test, but failed. When dealer returned the car back to me, "check engine" light was on.
I've searched few hours, but still have no idea how to do with it.
Is there any chance to get it pass without returning to stock?
:thanks: :thanks:
Before you overreact. Why is the Check Engine Light On? That is why you failed... I am not convinced you would have failed otherwise.

What year is your car?

Tomasz
 

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The recommendation I received straight from the experts at Borla is, as others have mentioned here, to make sure the cats are hot when you take the car in to test. The purpose of the secondary cats (which are usually removed when an aftermarket exhaust is installed) is to 'clean up' emissions missed by the primary cats when they're cold (and at their least efficient).
That is a bit confusing. You still have secondary cats - primary cats are the ones Borla removes. It is counterintuitive... Primary cats are second in line from the engine, warm-up cats (secondary) are integrated with headers.
 

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Discussion Starter #8
Before you overreact. Why is the Check Engine Light On? That is why you failed... I am not convinced you would have failed otherwise.

What year is your car?

Tomasz
I think the check engine light was caused by O2 sensor.
My car is 08. I just moved to CA, and the due day of the registration is coming...
 

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Thanks a lot for all the input, I'll probably go to do oil change, fill up race fuel, and make cats very hoooot before doing another try.
 

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You may also want to consider the Softronic flash. Not sure about the emissions part but the CEL is typically caused by a difference in the pre/post O2 sensor if the O2 sensor was the cause. From what I've read it's fairly common with Capristo's higher flow cats. I've also heard of it popping up with other cat backs due to flow increase.

Softronic resets this difference signal. At least with SRP and I believe standard flash. Do tell Scott what you're doing. He may know other solutions also.

I don't think racing fuel was the recommendation. Think oxygenated low emissions gas with the additive. Then get them smoking hot.
 

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I think the check engine light was caused by O2 sensor.
Your car was on a roller during the test, no? The PSM system doesn't like the front wheels being stationary while the rears are spinning. That's your CEL. Happened to me too.
 

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Your car will never pass a Smog Check regardless of how hot the cats are.

The vehicle failed for excessive tailpipe emissions and for having the MIL illuminated. The vehicles on-board computer is downloaded during the test, and in your case the analyzer found that you have a PO431 code stored. This code represents a catalytic converter efficiency problem, the car thinks one of the converters is worn out. Until the code is cleared and the monitors (self tests) are successfully run to completion, you will never pass and be issued a certificate.

Actually your vehicle should have failed for three reasons, it should have also failed the visual for having one set of converters missing and the second set are not approved for use in california with a clearly printed executive order (EO) number. It would be easier to reinstall the stock stuff and get the car registered for California. Once registered, you may not need to deal with a Smog Check until 2012 if yours is an 2006 model.
 

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That is a bit confusing. You still have secondary cats - primary cats are the ones Borla removes. It is counterintuitive... Primary cats are second in line from the engine, warm-up cats (secondary) are integrated with headers.
Wrong. Cat-back exhausts delete the secondary cats, which are the most distal cats in the exhaust path and are not monitored by the car's electronics (at least in Porsche's case).

http://www.planet-9.com/cayman-boxs...catback-exhaust-pn-12653-a-34.html#post268858

http://www.planet-9.com/cayman-boxs...catback-exhaust-pn-12653-a-16.html#post235802

I have an aftermarket cat-back exhaust on it from Stillen, which also eliminates the secondary cat for each cylinder bank, leaving only the primary cats in place. This fact did worry me initially, as I must pass an emissions test every year to qualify for registration renewal.

Please be advised the secondary cats are in the system only to help reduce emissions at start-up, before the primary cats heat up to their normal operating temp. When you go in for an emissions test, simply leave the car running while you wait in line, so your cat primaries stay hot.
http://garage.redlinemotive.com/story/borla-nissan-gt-r-true-dual-race-exhaust/

Borla has released a true dual exhaust system for the 2009+ Nissan GT-R. This true dual racing system eliminates the secondary cats and is intended for off road use.
 

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Your car will never pass a Smog Check regardless of how hot the cats are.

The vehicle failed for excessive tailpipe emissions and for having the MIL illuminated. The vehicles on-board computer is downloaded during the test, and in your case the analyzer found that you have a PO431 code stored. This code represents a catalytic converter efficiency problem, the car thinks one of the converters is worn out. Until the code is cleared and the monitors (self tests) are successfully run to completion, you will never pass and be issued a certificate.

Actually your vehicle should have failed for three reasons, it should have also failed the visual for having one set of converters missing and the second set are not approved for use in california with a clearly printed executive order (EO) number. It would be easier to reinstall the stock stuff and get the car registered for California. Once registered, you may not need to deal with a Smog Check until 2012 if yours is an 2006 model.
You sound knowledgeable, but I am not sure this applies in the real world to everyone with a cat back system in CA. You have stated the letter of the law, and are correct, of course. It is illegal to modify your exhaust. Period. But as a practical matter, I think the story is a bit different.

The visual inspection is somewhat subjective. A cat back exhaust won't raise alarm bells with many smog check stations. You may run a station and go out of your way to fail people you think have modified their cars, but when I asked my smog guy about my car he seriously had no idea what the exhaust was supposed to look like on a Cayman. I have friends who have supercharged BMWs that never fail the visual despite the lack of the CARB exemption stickers because most people look under the hood a see a stock engine bay as far as they are concerned.

A "visual check" of the CEL is another thing altogether. It is on, you fail.

My understanding is that our cars can't tell if hydrocarbons are getting out the end of the tailpipe when the car is cold. Only the emissions test will catch that. And if your car is properly warmed up, your HC levels should be fine.

That leaves the code. That seems to be the deal killer in the OP's case. My Borla exhaust doesn't trigger any codes. I have a code reader and I know. The CEL does not come on either.

What am I missing here?
 

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Your car will never pass a Smog Check regardless of how hot the cats are.

The vehicle failed for excessive tailpipe emissions and for having the MIL illuminated. The vehicles on-board computer is downloaded during the test, and in your case the analyzer found that you have a PO431 code stored. This code represents a catalytic converter efficiency problem, the car thinks one of the converters is worn out. Until the code is cleared and the monitors (self tests) are successfully run to completion, you will never pass and be issued a certificate.

Actually your vehicle should have failed for three reasons, it should have also failed the visual for having one set of converters missing and the second set are not approved for use in california with a clearly printed executive order (EO) number. It would be easier to reinstall the stock stuff and get the car registered for California. Once registered, you may not need to deal with a Smog Check until 2012 if yours is an 2006 model.
I'm not sure about this but my EVO8 that has full exhaust with down pipe (not CA approved), high lift HKS cams, AEM CAM gears, and ECU piggy back passed the smog check. It has the stock CATs (I have to swap out the high flow CAT). It even passed the visual inspection since everything was covered. The key here is to make sure that you do not get that P0431 code which I had before on my EVO. What I did is I bought an anitfouler from Pep Boys or any auto shop for 5 bucks. It will extend the sensor up by some inches away from the exhaust path. Once you fixed this problem (P0431) drive the car for so many miles because I think those smog testers have a way of knowing that the OBD system has been reset. I drove my EVO for 200 miles and never had that OBD error anymore. Then I brought it to a shop that tunes Mustangs and Hondas. These kind of shops sometimes have a smog check facility and they really know the dilemma you're having. Make sure the CATs are really hot. Also these shops follow the books of smog testing. As long as it passes visually and you have a catalytic converters they will hook it up to their machine. They don't care how the car sounds because sound inspection is not part of smog test. My EVO sounds really lumpy like a drag car and they already know I am running CAMs. They opened the hood and everything looks stock inluding hoses and air filters. They run the check and it passed with flying colors.
But in any case there's always a borderline with this issues and there's always a solution. In a Cayman there's really nothing to visually inspect unless you have the TPC turbo on it which is very obvious. CAT back exhaust will always pass unless the technician doing the smog check is an ***. Look for a mod friendly shop that has a smog facility. They understand your problem about the need for mods. :) Good luck!
 

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you sound knowledgeable, but i am not sure this applies in the real world to everyone with a cat back system in ca. You have stated the letter of the law, and are correct, of course. It is illegal to modify your exhaust. Period. But as a practical matter, i think the story is a bit different.

The visual inspection is somewhat subjective. A cat back exhaust won't raise alarm bells with many smog check stations. You may run a station and go out of your way to fail people you think have modified their cars, but when i asked my smog guy about my car he seriously had no idea what the exhaust was supposed to look like on a cayman. I have friends who have supercharged bmws that never fail the visual despite the lack of the carb exemption stickers because most people look under the hood a see a stock engine bay as far as they are concerned.

A "visual check" of the cel is another thing altogether. It is on, you fail.

My understanding is that our cars can't tell if hydrocarbons are getting out the end of the tailpipe when the car is cold. Only the emissions test will catch that. And if your car is properly warmed up, your hc levels should be fine.

That leaves the code. That seems to be the deal killer in the op's case. My borla exhaust doesn't trigger any codes. I have a code reader and i know. The cel does not come on either.

What am i missing here?

very true.
 

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Trust me, I have a cayman and tempted to install and exhaust system, but I don't think anyone makes a legal product. That cat back thing is misleading, you can't remove any converters or replace any converters with an unapproved part. The stock system has two of the converters built into the exhaust making it difficult for the untrained eye to discern during a Smog Check, you just blew it by some unsuspecting technician.

When I stated that you will never pass a Smog Check, I meant that that the Cayman with the Capristo's higher flow cats will not pass, at least, because of the code stored and the MIL illumination. During a Smog Check, the technician must inspect for the presence of the converters, and if the converters are aftermarket, the part number must be on an approved list. Capristo's higher flow cats are shiny and cause for further investigation, but the stock cats as used on the Borla system may not draw the same attention, though still not legal. Anytime the MIL illuminates, the manufacturer, Porsche has determined that the vehicle outputs at least 1.5 times the emissions that the vehicle was certified for sale in California (OBD II). If the MIL is illuminated with a PO431 code it will probably fail the Smog Check for excessive tailpipe emissions, such as Ricky's did.

The guy that certified the supercharged BMW is an idiot, if he can't determine that the vehicle has a aftermarket supercharger, with all the pluming, I wouldn't let him drive my 70k Cayman on a dynamometer.

The main reason the Smog Check program is so stringent, is not to catch the Cayman's with modified exhausts, but rather the highly modified "rice rockets" that are street racing and killing folks; Unfortunately, the same test must be applied to all vehicles. The program is called "drag net", ask any California police officer.
 

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Hmm, see classifieds. The Cargraphic after market exhaust I am selling looks just like a stock unit, and has race cats instead of OEM ones installed. There is almost no way that any mechanic but a Porsche specialist could tell them apart. Cats are usually covered with exhaust pipe... most people do not have X-Ray vision. So if it looks the same on the outside, it will pass for sure.
 

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Let me help you some more.

2006 had bad ECU programming which caused some stock cars to fail identically to yours. You can start by going to your dealer and asking if the ECU has been updated - if not - they will do it under warranty.

Then eitehr buy Durametric or find someone with one or with a simple OBD2 reader and make sure there are no codes. If you have any codes or readiness is not set - you will fail. No matter what is coming out of the exhaust pipe.

Assuming that your Capristo is capable of cleaning up your exhaust to pass emissions (it should be) you can help it by going to the dealer with it heated up. 10 mile drive will do it for sure.

No need for fancy fuel. They also sell stuff at auto stores that promises to help with smog check. I am not sure what it does, but maybe worth researching.
 
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