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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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Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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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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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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All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Sat, Feb-16-2019, 09:54:25 PM   #65
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Default Re: DIY: Aftermarket header and section 1 install

What is a CRT? And where do you plug your O2 sensor when you got catless?
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Old Wed, Feb-20-2019, 10:48:33 PM   #66
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Default Re: DIY: Aftermarket header and section 1 install

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What is a CRT? And where do you plug your O2 sensor when you got catless?
CRT = catted rasp terminator. A CPI product. CPI is done, but bimmerworld took over, not sure if they have CRTs anymore though.

If you don't plan on using post cat O2s (rear O2s), code them out (hex editor or ecuwerx binary tool) and simply unplug the O2s at the harness as you have no need for them. Cap any left over bungs.
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Old Wed, Feb-20-2019, 10:51:31 PM   #67
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by TboneM3 View Post
CRT = catted rasp terminator. A CPI product. CPI is done, but bimmerworld took over, not sure if they have CRTs anymore though.



If you don't plan on using post cat O2s (rear O2s), code them out (hex editor or ecuwerx binary tool) and simply unplug the O2s at the harness as you have no need for them. Cap any left over bungs.


Didnít know CPI was over. Jack at custom performance was such a nice guy.


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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)