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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Mon, May-14-2018, 03:56:24 PM   #61
mrgizmo04
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by Hender107 View Post
Started this project over the weekend, and everything seems pretty straight forward so far, letting the header nuts soak now. Can anyone offer a little more in depth info/process of extending and routing the O2 sensors (I'm using euro headers and cats). I understand you just pull them put to extend but I don't want to just start yanking and break clips or anything. Also, once everything is out, I'm assuming screw the O2 sensors into the headers before putting them back up into place?
Follow the rear o2 sensor wires behind the block and behind the intake box. You will see they are connected to a harness. You can send that harness down into the tunnel above/on the side of the bell housing and have the wires reach that way. No splicing or artificial extension of wires needed.

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Old Mon, May-14-2018, 04:44:38 PM   #62
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Default Re: DIY: Aftermarket header and section 1 install

Yes, screw the O2 sensors into place on the euro exhaust before mounting


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Old Fri, Sep-21-2018, 12:17:17 AM   #63
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by Smoked M3 View Post

14. Go underneath the car and loosen the bolts holding the forward exhaust section (aka Section 1 or "S" pipe) to the US headers. You will need a 10mm open wrench and a 14mm open wrench.


I'm in the middle of my install. I just stripped the bolt between headers and section 1 using a 10mm wrench. It is not a 10mm, it is an inverted torx. Going out to buy the torx bit now. Hopefully I can get the bolt out. If not I'm screwed.





Sorry to bump old thread..... but can anyone confirm the size needed of the inverted torx needed to undo section from headers please ??

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Old Fri, Sep-21-2018, 01:17:13 AM   #64
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by grandchmason View Post
Sorry to bump old thread..... but can anyone confirm the size needed of the inverted torx needed to undo section from headers please ??

Depends on bolts you have there, the heads will be E10 or E12. E10 is about 9.4mm, E12 is about 11.1mm.

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Discussing DIY: Aftermarket header and section 1 install in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)