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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Dec-13-2009, 04:40:03 PM   #11
///M3THOD
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Originally Posted by hogger453 View Post
For future ref. Iv'e done four header jobs on the M3.

Number it like this:
#1 front bank
#2 rear bank
#3 front mate
#4 rear mate

The evens and odds always stay together. Works for me

If you keep driving the way you are you're going to burn up your exhaust valves.

Cats are crucial. The ECU is not going to learn the car the way it is. The peramitters are just not there. If your going to run it without cats get software ASAP.
This is not completely accurate... not only am I running the car with no cats, but the car has a smooth powerband and no SES. I have put several thousand miles on the car and it's very driveable and smooth. The ECU will learn the optimal conditions to operate the car at within a certain range, but I believe your correct about the parameters. I don't think the ECU can compensate the fuel trims drastically enough to optimize performance with no cats. I don't know though, my car is pretty smooth, I guess the only way I could compare would be with some software.
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Old Sun, Dec-13-2009, 07:20:23 PM   #12
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I found this diagram on a different thread. Make sure Bank 1 sensor is attached to the front header. Bank 2 sensor is attached to rear header.
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Old Sun, Dec-13-2009, 10:34:26 PM   #13
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most likely o2's hooked up backwards like everyone else said


as far as a vacuum leak uniqueM3 check all lines and anything you could have touched
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Old Mon, Dec-14-2009, 12:12:49 AM   #14
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tomorrow i will get it on a lift and swap the o2 sensors. i will let you guys know the results. thanks for all your help
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Old Mon, Dec-14-2009, 09:52:39 PM   #15
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i checked today and i have the o2 sensor plugged in the right headers. the miss firing is hit and miss still. when it smoothes out the car runs really great. i am thinking i have a bad o2 sensor.
also i am thinking of just getting the custom performance innovations crt section 1, which will have post cat bungs. i wonder if i can get them to weld in a bung for my egt sensor?
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Old Tue, Dec-15-2009, 05:27:12 AM   #16
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man.... headers seem like a huge headache..
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Old Tue, Dec-15-2009, 05:38:14 AM   #17
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man.... headers seem like a huge headache..
+1....
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Old Tue, Dec-15-2009, 08:30:35 AM   #18
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Originally Posted by CRIIM44 View Post
most likely o2's hooked up backwards like everyone else said


as far as a vacuum leak uniqueM3 check all lines and anything you could have touched
Well that's the thing that I didn't install them. The missfire is fixed for now but the motor is still running lean. And ses light still on

but yeah headers is getting to be a headache and just money to figure out if it has any problems.
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Old Tue, Dec-15-2009, 09:47:34 AM   #19
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Originally Posted by ///M.EngT View Post
man.... headers seem like a huge headache..
+1....hopefully the power is worth it the struggle
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Old Tue, Dec-15-2009, 10:46:43 AM   #20
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Originally Posted by achtungM3 View Post
i checked today and i have the o2 sensor plugged in the right headers. the miss firing is hit and miss still. when it smoothes out the car runs really great. i am thinking i have a bad o2 sensor.
also i am thinking of just getting the custom performance innovations crt section 1, which will have post cat bungs. i wonder if i can get them to weld in a bung for my egt sensor?
On the Euro M3, the EGT port is on section 1, before the cat. If you don't have the EGT probe installed, you will get a CEL, but the car should run OK. I have built a few Euro CRT where the EGT port is on the front of the cat on the CRT. Like this...



With this setup, it's just plug and play. You would just need to ensure the pre and post O2s are in the right location. Then, install the EGT probe. No CEL, no rasp, and no software needed. The challenge is finding an EGT port to weld onto the CRT cat. The EGT port pictured above come off a set of OE headers. If you have a old set of OE headers, and can cut the EGT port off, then I can build you a Euro CRT.

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Discussing euro headers no cats... in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)