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So when you change out your OEM "CAT" to High-flow or test-pipe, if you get CEL, you cannot bypass? (UPREV) ? I wonder if they are going down the same

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Old 03-29-2023, 12:52 PM   #1 (permalink)
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So when you change out your OEM "CAT" to High-flow or test-pipe, if you get CEL, you cannot bypass?

(UPREV) ? I wonder if they are going down the same road? or being forced.

Last edited by ZoomZ; 03-30-2023 at 11:45 AM.
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Old 03-29-2023, 02:32 PM   #2 (permalink)
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Originally Posted by ZoomZ View Post
So when you change out your OEM "CAT" to High-flow or test-pipe, if you get CEL, you cannot bypass?

Who the other big tuner software? I forget. I wonder if they are going down the same road? or being forced.
That's pretty much the tl;dr of it.

UpRev? I'm not sure what their status is on the EPA crackdown.
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Old 03-30-2023, 04:43 AM   #3 (permalink)
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Originally Posted by isayimandrew View Post
That's pretty much the tl;dr of it.

UpRev? I'm not sure what their status is on the EPA crackdown.
If the tuner wants to stay in business. He will be doing this to.
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Old 03-29-2023, 05:04 PM   #4 (permalink)
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Originally Posted by ZoomZ View Post
So when you change out your OEM "CAT" to High-flow or test-pipe, if you get CEL, you cannot bypass?

Who the other big tuner software? I forget. I wonder if they are going down the same road? or being forced.

I thought some people use a “J-bung” on the test pipes so that the sensor isn’t reading the accurate value and so the O2 sensor functionality can remain untouched.

Am I wrong?


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Old 03-30-2023, 11:43 AM   #5 (permalink)
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Originally Posted by Averying View Post
I thought some people use a “J-bung” on the test pipes so that the sensor isn’t reading the accurate value and so the O2 sensor functionality can remain untouched.

Am I wrong?


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No, but I think it still happens. (what I'm reading anyways)
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