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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 Sun, Dec-20-2015, 01:09:12 PM   #41
bmwJohhnyD
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by erickrayos View Post
don't know if I missed it, since the stock header got the catalytic converters w/ it, w/ these aftermarket headers the cats are eliminated. but the O2 sensors are still mounted on it both pre and post cat O2 sensors am I right? if you weld the new cats on section one the post cat sensors still isn't reading the right numbers.. unless I am missing something and the post cat sensors are relocated... sorry new to this exhaust modifications.
i think i understand your question and yes if you add new cat converters into the section 1 you need to relocate your post cat sensors downstream of those cat converters as well or the exhaust system will still think it is without the cat converters

or you could buy an aftermarket peice with the cats installed and the sensors in the correct place

http://www.custom-performance.net/pr...idcategory=254

Last edited by bmwJohhnyD; Sun, Dec-20-2015 at 01:12:34 PM.
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Old Sun, Dec-20-2015, 01:52:08 PM   #42
erickrayos
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Default Re: DIY: Aftermarket header and section 1 install

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i think i understand your question and yes if you add new cat converters into the section 1 you need to relocate your post cat sensors downstream of those cat converters as well or the exhaust system will still think it is without the cat converters

or you could buy an aftermarket peice with the cats installed and the sensors in the correct place

http://www.custom-performance.net/pr...idcategory=254
yes exactly, another question, what's the difference between 400 and 200 cell? coz I've seen there's a 200cell version of that section one.. and how do you extend the O2 sensor cables? is there an extention adapter you can buy somewhere?
coz I am about to get an this M3 and all maintenance required has been done on it recently on the dealer. counting out the "emergency funds" just in case something breaks down I got 3grand to play with, it already has a remus muffler but it still sounds too timid for my taste, headers+section one should do the trick I guess.
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Old Sun, Dec-20-2015, 03:01:26 PM   #43
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by erickrayos View Post
yes exactly, another question, what's the difference between 400 and 200 cell? coz I've seen there's a 200cell version of that section one.. and how do you extend the O2 sensor cables? is there an extention adapter you can buy somewhere?
coz I am about to get an this M3 and all maintenance required has been done on it recently on the dealer. counting out the "emergency funds" just in case something breaks down I got 3grand to play with, it already has a remus muffler but it still sounds too timid for my taste, headers+section one should do the trick I guess.
there was another diy that showed how to "unfold" the o2 sensor wires.. i belive the length is there.. you route them on the transmission side right out of the dme.

another member teraphantom did a really nice routing where he used oem euro harnesses and looms.

i just kind of tied mine off with zip ties and such. looks ugly but it still runs.. lol

i have seen extender kits pop up here and there but the consensus is you dont need if you unfold them and route them down the transmission

the user on here dafoe has done this about a million times.. maybe he can help if you pm him.
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Old Sun, Dec-20-2015, 03:03:51 PM   #44
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by erickrayos View Post
don't know if I missed it, since the stock header got the catalytic converters w/ it, w/ these aftermarket headers the cats are eliminated. but the O2 sensors are still mounted on it both pre and post cat O2 sensors am I right? if you weld the new cats on section one the post cat sensors still isn't reading the right numbers.. unless I am missing something and the post cat sensors are relocated... sorry new to this exhaust modifications.
If you're going to have a cats on your sec 1. Your post 02 sesors will be on your section 1 not your headers. You will just use bung plugs on your headers. GL

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Old Sun, Dec-20-2015, 04:03:43 PM   #45
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Default Re: DIY: Aftermarket header and section 1 install

ok if the o2 sensor cable should be long enough then there shouldn't really be a problem then. I can most likely figure out where to route it as long as the length is sufficient enough to reach down to the section 1 mounts for the o2 sensors. thanks!
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Old Sun, Dec-20-2015, 04:08:45 PM   #46
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Default Re: DIY: Aftermarket header and section 1 install

More than enough slack just fish up one of those wire grabbers to the back of firewall and hook up the o2 wires then pull down and route along or on top of transmission.


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Old Sun, Dec-20-2015, 05:25:33 PM   #47
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Default DIY: Aftermarket header and section 1 install

Make sure you label the O2 sensors (Pre and Post) before disconnecting everything. The two Post cat O2 sensors have to be taken out of the wiring loom just behind the valve cover. If I remember right I had to cut the loom all the way over past the intake next to the firewall and then route it down the drivers side. (Becareful cutting the wire loom) If you do it right there is plenty of wire.
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Old Mon, Mar-26-2018, 02:04:33 PM   #48
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Default Re: DIY: Aftermarket header and section 1 install

Did people who completed this DIY find it necessary to have all of the replacement hardware if keeping the original length studs? Obviously it makes sense to replace the gaskets, but Id rather not buy $150-200 worth of nuts and bolts if people can typically reuse existing hardware.


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Old Thu, Mar-29-2018, 01:14:57 AM   #49
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Default Re: DIY: Aftermarket header and section 1 install

BTW if you're changing section 1 as well, looks like these are the parts between section 1 & 2:
(6) bolts - 07119902901
(6) nuts - 11621744323
(2) gaskets - 18307830674
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Old Sun, Apr-08-2018, 01:55:44 PM   #50
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Default Re: DIY: Aftermarket header and section 1 install

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Originally Posted by DvSkD4 View Post
Did people who completed this DIY find it necessary to have all of the replacement hardware if keeping the original length studs? Obviously it makes sense to replace the gaskets, but Id rather not buy $150-200 worth of nuts and bolts if people can typically reuse existing hardware.


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It depends on the flanges for the headers you are installing. I replaced my studs with longer ones and I had thin flanges...it was a nightmare to get back together due to the extra threads in a tight space. Completely unnecessary with no added benefit. Use the standard stud length and just get new hardware. That is my recommendation.
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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)