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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-02-2008, 06:36 AM   #1
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Plug extra hole in downpipe?

I just picked up a slightly used GS V2 downpipe. The previous owner was using a clamp on thermo coupler after the first o2.



Whats everyones opinon on the best method of plugging it? Should I just have it welded shut?

I was considering just tapping the hole and threading a bolt into it. But obviously the stainless is very thin. Don't know how long that would last.
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Old 09-02-2008, 06:48 AM   #2
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Quote:
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I just picked up a slightly used GS V2 downpipe. The previous owner was using a clamp on thermo coupler after the first o2.



Whats everyones opinon on the best method of plugging it? Should I just have it welded shut?

I was considering just tapping the hole and threading a bolt into it. But obviously the stainless is very thin. Don't know how long that would last.
You could weld it shut, or get a stainless bung welded on there and cap that until you get a wideband, or cap it forever.
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Old 09-02-2008, 06:50 AM   #3
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That's what I was thinking about the wideband. But Nick told me to put it down by the oil pan. And I recall reading somewhere that it's suppose to not be close to the turbo.

I suppose I could just get a small stainless bung welded on though, as you suggested.
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Old 09-02-2008, 07:42 AM   #4
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You can run it there. I have never overheated one of the bosch widebands.

I would put it down by the oil filter is easier to get to.
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Old 09-02-2008, 07:58 AM   #5
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You can run it there. I have never overheated one of the bosch widebands.

I would put it down by the oil filter is easier to get to.
It's not going to be affected by the other o2 "blocking" the exhaust stream at all is it?
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Old 09-02-2008, 09:35 AM   #6
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Yes it will work fine there. However, almost all wideband producers suggest mounting at least 1-2ft downstream, pre-cat.

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Old 09-02-2008, 09:38 AM   #7
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Could put the a EGT probe in there. I know thats supposed to go pre-turbine but its there.



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