Carb Legal DP?

[TurboNate]

Sorry if it's been posted before. But I couldn't find any updated answers on this. Are there any CARB legal downpipes for the B8? I'm fortunate to live in Cali, and I don't want to have to revert to stock every time I need a smog done.


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[MrTylerRaines]

Sorry if it's been posted before. But I couldn't find any updated answers on this. Are there any CARB legal downpipes for the B8? I'm fortunate to live in Cali, and I don't want to have to revert to stock every time I need a smog done.


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I would look up the law and go from there. I know in ohio that as long as u dont go test pipe and go high flow cat u will most likely pass e-check (some counties dont care or even do e-check) But i dont know cali law. Sorry if this doesnt help.


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[adamazing]

No, not in California.

You can try running an O2 spacer to trick the rear sensor on a stock or stage 1 tune, but you're still running the risk of failing visual inspection.

[TurboNate]

No, not in California.

You can try running an O2 spacer to trick the rear sensor on a stock or stage 1 tune, but you're still running the risk of failing visual inspection.

Dang I really wanna go stage 2


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[ToddBrunswick]

Dang I really wanna go stage 2


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Plenty of people in CA have gone Stage 2. I wouldn't worry about the visual inspection. CA has plenty of sketchy emissions places that won't fail you on visual. Mess around with finding the right spacer. If you really want it that bad, you can definitely make it work. Worse comes to worst, put on your stock cat for the inspection.

[Sauci]

Honestly, once you've done the cat once, it's not that difficult. Swapping it every 2 years isn't that bad.

[TurboNate]

Plenty of people in CA have gone Stage 2. I wouldn't worry about the visual inspection. CA has plenty of sketchy emissions places that won't fail you on visual. Mess around with finding the right spacer. If you really want it that bad, you can definitely make it work. Worse comes to worst, put on your stock cat for the inspection.

Would I have to remove the tune if going back to stock CAT?


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[ToddBrunswick]

Would I have to remove the tune if going back to stock CAT?


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Depends what your tune is. You can't have a tune that removes the O2 sensor reading while you're getting your emissions tested. But if you have a loaded APR tune for example, you can switch to APR's version of stock without removing the tune from your ECU. This will allow the emissions to see that your O2 sensor is working and ready to be read.

[Sauci]

I was under the impression that you could run for a limited time even with the tune and stock dp. There was a thread about that which I can't seem to find.

[ToddBrunswick]

I was under the impression that you could run for a limited time even with the tune and stock dp. There was a thread about that which I can't seem to find.

Not sure what you mean. If you don't have a HFC or testpipe, you'd only be running a stage 1 tune, which shouldn't change the O2 sensor reading. So in that case you'd be fine from an emissions stand point.

[Sauci]

Not sure what you mean. If you don't have a HFC or testpipe, you'd only be running a stage 1 tune, which shouldn't change the O2 sensor reading. So in that case you'd be fine from an emissions stand point.

I mean if I have stage 2 with a HFC and have to go back to stock for smog, I thought it was ok to run the stage 2 tune with stock cat for a limited time. Essentially, to the smog place and back.

[ToddBrunswick]

I mean if I have stage 2 with a HFC and have to go back to stock for smog, I thought it was ok to run the stage 2 tune with stock cat for a limited time. Essentially, to the smog place and back.

My understanding (and anyone with better information please chime in) is that the stage 2 software makes is so you can't read the O2 sensor in order to avoid a CEL. During the emissions test, they need to see that your O2 sensor is able to be read. So even with the stock cat, the software would trigger a fail when the emissions place plugs it in and can't get a reading from the O2 sensor.

[Sauci]

My understanding (and anyone with better information please chime in) is that the stage 2 software makes is so you can't read the O2 sensor in order to avoid a CEL. During the emissions test, they need to see that your O2 sensor is able to be read. So even with the stock cat, the software would trigger a fail when the emissions place plugs it in and can't get a reading from the O2 sensor.

APR has 2 different version of the stage 2 software. One is for a test pipe where it ignores the sensor. The other is for a HFC which is why you would need the spacer before the sensor which is the one i was referring to

[ToddBrunswick]

APR has 2 different version of the stage 2 software. One is for a test pipe where it ignores the sensor. The other is for a HFC which is why you would need the spacer before the sensor which is the one i was referring to

From what I've read the Stage 2 software makes it so the second O2 sensor can't get a read, so you won't get a CEL. When you take it to emissions and they plug it in, it will say the secondary O2 is inactive and will fail you for that. So even with the stock cat in, you'll get a fail since emissions can't get a reading from the second O2 sensor. As far as I understand, if the software codes out the secondary O2, the spacer isn't doing anything. The spacer is only helping when you flash back to stock (or stage 1) when your car is taking a reading from the secondary O2 sensor again.

This thread has some more info. http://www.audizine.com/forum/showth...ot-go-together

[hyperunion]

APR has 2 different version of the stage 2 software. One is for a test pipe where it ignores the sensor. The other is for a HFC which is why you would need the spacer before the sensor which is the one i was referring to

Apr just has the one stg2 tune for hfc or test pipe....

[ToddBrunswick]

APR has 2 different version of the stage 2 software. One is for a test pipe where it ignores the sensor. The other is for a HFC which is why you would need the spacer before the sensor which is the one i was referring to

Apr just has the one stg2 tune for hfc or test pipe....

Hyperunion is correct. I just confirmed with APR that it's the same turn regardless of HFC or TP.