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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 01-18-2008, 04:22 AM   #1
Tonester
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!! E46 M3 EBAY Header DYNO Tested !!

Installed headers on Dec 28th, I drove the car over 200 miles and finally scheduled an appointment to get my car dyno'd at SP Engineering.

Installation was a breeze, Header lined up w/ ease. Longer studs were not needed since I purchased new OEM gaskets took about 3hours to do everything including welding the o2 simulator in and extending the o2 sensor harness.


I do not have software. Only mods are BMC filter, Streamline arm, Ebay header... EVERYTHING else is stock.

Went into dyno and the results are as follows...

My Car | 78,000 Miles | Black Ceramic coated header ordered from Ebay
Bone Stock: Max POWER= 258.8 | Max TORQUE= 229.7
BMC + Streamline arm + Ebay header: Max POWER= 279.6 | Max TORQUE= 235.4

Edzilla's car | 45,000 Miles | JVT header ordered from SP Engineering
Gruppe M intake, Gruppe M Muffler, Ebay header: Max POWER= 291.2 | Max TORQUE= 242.3

Video of Edzilla's dyno run -


Maximum gain of 24.5hp and 18.5trq at the wheels from 6500rpm-8000 rpms give or take 2-3hp.

Average gain of 20hp and 13trq at the wheels all the way through the powerband.

I could not compare my previous run from the last time I dynoed b/c I have removed my Eisen Sec2 and Eisen Race Muffler. So for most consistant comparison I overlayed it w/ my bone stock run.

So for about $250 you can have an extra 20-25 horses to the wheels. :thumbsup2::thumbsup2::shiftdriv

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Last edited by Tonester; 01-18-2008 at 04:40 AM.
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Old 01-18-2008, 04:23 AM   #2
versace7866
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how was the install of the ebay headers?
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Old 01-18-2008, 04:25 AM   #3
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Quote:
Originally Posted by Tonester View Post
Installed headers on Dec 28th, I drove the car over 200 miles and finally scheduled an appointment to get my car dyno'd at SP Engineering.

Installation was a breeze, Header lined up w/ ease. Longer studs were not needed since I purchased new OEM gaskets took about 3hours to do everything including welding the o2 simulator in and extending the o2 sensor harness.
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Old 01-18-2008, 04:26 AM   #4
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whoopsy..past my bed time..haha
did you ceramic coat it? i'd be worried about longevity..even supersprint headers break..
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Old 01-18-2008, 04:31 AM   #5
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I didn't coat it.. i got the coated ones from ebay... I wanted to keep engine bay temps lower.

I'm not too worried about longevity for $100... plus SP does TIG welding if there was ever a problem. =D
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Old 01-18-2008, 04:38 AM   #6
versace7866
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I didn't coat it.. i got the coated ones from ebay... I wanted to keep engine bay temps lower.

I'm not too worried about longevity for $100... plus SP does TIG welding if there was ever a problem. =D
how much does SP charge to install headers if you know..
just wondering
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Old 01-18-2008, 04:39 AM   #7
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I installed my own, I don't know how much they would charge.. give them a call and talk to Ed.
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Old 01-18-2008, 07:17 AM   #8
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Great thread. I am going to seriously consider this.

Gotta read up on it though and call my aftermarket guy to see how much for the install.
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Old 01-18-2008, 07:38 AM   #9
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Did you do the o2sim and resistor for the heater element? Or did you just use the heater element from your oem O2 sensors?

Great results, by the way! 20hp!!
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Old 01-18-2008, 08:25 AM   #10
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Wow, that's very good hp gain. To the OP, it's nice to see the number on the dyno but how is it on the road test?
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Old 01-18-2008, 09:30 AM   #11
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Tp//M3 just curious are those 18's you got on the car ? looks sweet
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Old 01-18-2008, 09:59 AM   #12
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Tp//M3 just curious are those 18's you got on the car ? looks sweet
No, they're 19's. Thanks.
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Old 01-18-2008, 10:14 AM   #13
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With a tune youll definitly complete your M, you should pick up a few more hp. Nice post and good dyno numbers. Thanks Tp//M3
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Old 01-18-2008, 10:21 AM   #14
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nice numbers. Def good bang for the buck.
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Old 01-18-2008, 10:38 AM   #15
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Nice bro! I wonder if it will pass CA smog...
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Old 01-18-2008, 10:52 AM   #16
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Awesome results. Does anyone have a link to these headers?
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Old 01-18-2008, 10:55 AM   #17
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isn't 258rwhp kind of low for stock?
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Old 01-18-2008, 10:55 AM   #18
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To the OP...

How do the headers sound with the stock exhaust set up?
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Old 01-18-2008, 11:21 AM   #19
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ur stock power was kinda low, but still even if it was a 10hp gain thats impressive

post/pm me the sellers name.. im looking into doing headers and exhaust in the future
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Old 01-18-2008, 12:17 PM   #20
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Yes please post up the ebay sellers ID. There are over a 1000 headers for this car on ebay and I can't tell the difference between the ones you got and the absolutely horrible ones.

Thanks!
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