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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 06-29-2011, 08:33 PM   #1
PimpNmyM3
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Ebay Header Questions

Well Im finally the proud owner of a newly installed set of Ebay Headers to go with my lonesome agency power exhaust.. plus just replaced my clutch after 4 years. Anyways, Car drives great since install, but still breaking in new clutch... now only 1 of the pre-cat sensors and the egt sensor were able to be installed due to location of sensor bungs. The remaining Pre-Cat and Two Post-Cat sensors are temporarily secured off to the side. My question is will only having the one pre-cat sensor installed effect when the car recieves a software upgrade or do all 4 get eliminated anyways during the re-flash? And is there a way (and is it okay to) to unplug the remaining sensors until I get software?

Thanks
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Old 06-29-2011, 08:37 PM   #2
///Mspired
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You want to keep the pre-cat sensors in until you get a tune. It is okay to remove the post-cat sensors and plug them but not the pre-cat sensors.
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Old 06-29-2011, 10:36 PM   #3
PimpNmyM3
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Well there was only room for one of the pre-cat headers to be installed..
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Old 06-30-2011, 05:40 AM   #4
///Mspired
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Well there was only room for one of the pre-cat headers to be installed..
That is not good, I would find a way to make it fit or get the tune asap. I have installed ebay headers on a car before, you have to improvise. See if there is anyway to make room.
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Old 06-30-2011, 10:56 AM   #5
PimpNmyM3
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That is not good, I would find a way to make it fit or get the tune asap. I have installed ebay headers on a car before, you have to improvise. See if there is anyway to make room.
Well.. why do you think thats not good? I mean if the other two are out whats the difference if1 of the pre-cats is out as well?

Im going to try to call a friend in a few who is a tech at the local dealer and see what he thinks..
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Old 06-30-2011, 11:42 AM   #6
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Okay.. got my answer from my friend who's a tech.. Im going to have to find a way to extend the harness for the remaining pre-cat sensor or weld in a bung closer so that the factory harness reaches..
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Old 06-30-2011, 12:15 PM   #7
Steven747
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how much shorter would the new bung be or how much longer would you extend it from the existing bung hole?
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Old 06-30-2011, 01:41 PM   #8
PimpNmyM3
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I'll have to measure and see how much further I need to extend the harness in order for it to be installed in the existing bung-hole (lol) on the ebay headers..
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Old 06-30-2011, 02:04 PM   #9
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if your replacing your pre's and you put it too close up will it have premature failure because of more heat? im guessing not because not much heat escapes between those 3 or 4 inches or so. can you put a new hole on the opposite side of the pipe that the current pre's are on?
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Old 07-03-2011, 11:42 AM   #10
PimpNmyM3
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can you put a new hole on the opposite side of the pipe that the current pre's are on?
I'll have to check but I believe so. I think the best way to deal with this issue is drilling a hold and weldinga new bung in so I can install the 02 sensor.
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Old 07-09-2011, 06:19 PM   #11
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Thats the problem with these Ebay headers...the location of the bungs. Most are not in the correct spot. I got lucky with mine. My tech just had to twist a pipe slightly so one sensor would clear the tranny and could be inserted.
In the end I was happy with mine. But I would have been less so if I had to start welding new bung holes.

All the "ceramic" coating flaked off mine. I suggest a professional coating or header paint. I dont know about ceramic from a spray can. Best bet is professionally applied 2 part coating. We have a guy locally that does this kind of work...well.

It may cost more than the headers cost to get them coated, but you know they will last better that way.
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