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Remove 2 Cats and still pass CA emissions?

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Old 03-29-2004, 01:08 PM
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Remove 2 Cats and still pass CA emissions?

Thinking about putting in a Helix UP and DP but keeping a catback exhaust (like Borla) on and thn getting an ECU tune

My car's an 03, bought last April

anyone know how the emissions look after that and when the car is due for it's first emissions test?
I can never remember
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Old 03-29-2004, 01:42 PM
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If you get the Helix uppipe and downpipe, you will be running catless. Therefore you won't be able to pass emissions. Accordign the the DMV, new car models need to get a smog check every 4 years.
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Old 03-29-2004, 01:51 PM
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I was under the impression there is still a cat in the midpipe on the exhaust
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Old 03-29-2004, 02:02 PM
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1 cat in Up-Pipe 2 in Downpipe .. You can buy a High Flow cat that you can put into your midpipe. Basically, when you replace your downpipe and get a cat-back .. everything behind your turbo is replaced. Maybe you were thinking of an Axel-Back.
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Old 03-29-2004, 02:05 PM
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^ What he said. 1 cat in the uppipe, the helix DP replaces 2 cats, the DP cat and the mid pipe cat, therefore runnin' no cats.
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Old 03-29-2004, 02:07 PM
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ya the helix downpipe replaces both the stock downpipe and the stock mid pipe. I am just trying to make that clear
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Old 03-29-2004, 02:09 PM
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ok ok
but if I ge teh helix pipes and a Borla catback

that makes it 1 cat right?

anyone know how the emissions on that look?
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Old 03-29-2004, 02:48 PM
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interesting

thx crash
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Old 03-29-2004, 04:03 PM
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Originally posted by crash n burn
There is no way it would pass. A friend of mine works with smog techs and they are running into a lot of 'new' cars that are getting their first smogs from 2000. I know they are V8's, but the Cadillac Northstars are failing he said, as an example. Cal emmisions are really strict and he was telling me that some other cars that are considered clean when new are really really close to the failing mark. I guess apparently, the cats they put in some of these cars are only good for about 30-50K miles.
That should be fixed under the warranty. If stock cats fail the first emission (if no tampering was involved), I think the manufacturer has to replace it.
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Old 03-29-2004, 04:06 PM
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Originally posted by Special---K
ok ok
but if I ge teh helix pipes and a Borla catback

that makes it 1 cat right?

anyone know how the emissions on that look?

like the other people said above, a helix dp/up will replace all cats. You will not have 1 cat left. You will have to buy a dp that replaces only the 2nd cat, then you'll have the last cat.

So if u were to go in for a smog check, and had 1 cat, you better make sure your car is running very hot when testing. Otherwise you'll most likely fail. But other than that, you might pass the sniffer test, but not the visual inspection (if they really look into it).
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Old 03-29-2004, 05:34 PM
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Originally posted by crash n burn
There is no way it would pass.
You so sure about that?

http://forums.nasioc.com/forums/show...=MRT+pass+smog
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Old 03-29-2004, 06:33 PM
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Originally posted by Special---K
ok ok
but if I ge teh helix pipes and a Borla catback

that makes it 1 cat right?

anyone know how the emissions on that look?
There are a total of 3 cats in your exhaust system,the Helix Downpipe gets rid of 2 of them. And will fail the smog emission test. There are other brands of downpipes that only just get rid of the Downpipe cat, leaving the midpipe cat still in. If you're lookin' to run with just 1 cat, find a high flow one, I think godspeed and some other brands have them. It will cost more, but you'll have a lot better chance than runnin' catless tryin' to pass smog. There has been someone that claimed to pass smog with 1 high flow cat, and unless you're lookin' to crank 400-500hp, that 1 high flow shouldn't hold you back all too bad to still be passing smog.

I know for a fact that the Fremont Smog station didn't even look under my car, or dig deep into the engine. So maybe he'll be the same with the rest.
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Old 03-29-2004, 07:03 PM
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helix up and down pipes get rids of all th cats
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Old 03-29-2004, 07:08 PM
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i cant beleive daredevil actually had to say it again ...
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