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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 Tue, Nov-14-2017, 01:57:09 AM   #11
m3e46freak
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Default Re: Euro Headers on US Spec E46 M3

I remember these threads lol
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Old Thu, Nov-16-2017, 03:45:41 AM   #12
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Default Re: Euro Headers on US Spec E46 M3

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Originally Posted by m3e46freak View Post
I remember these threads lol
Best fitment and no headaches will be them OE Euro headers. Oh yeah, get the LHD versions as the RHD has a flattened area on one of the primaries which is not only ugly but robs you of that 10hp.
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Old Thu, Nov-16-2017, 03:56:34 AM   #13
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Default Re: Euro Headers on US Spec E46 M3

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Best fitment and no headaches will be them OE Euro headers. Oh yeah, get the LHD versions as the RHD has a flattened area on one of the primaries which is not only ugly but robs you of that 10hp.


Pretty sure that myth has been busted with dyno results. The flat spot doesn’t cause any power loss.


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Old Thu, Nov-16-2017, 05:37:06 AM   #14
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Default Re: Euro Headers on US Spec E46 M3

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Originally Posted by dafoe View Post
Supersprint did all the R&D originally for this platform. Everyone copied the proven SS non stepped headers...
thanks for that info, makes a lot more sense than any other company making it and everyone else (including SS) copy them
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Old Thu, Nov-16-2017, 10:21:29 AM   #15
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Default Re: Euro Headers on US Spec E46 M3

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Best fitment and no headaches will be them OE Euro headers. Oh yeah, get the LHD versions as the RHD has a flattened area on one of the primaries which is not only ugly but robs you of that 10hp.
****er lmao....
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Old Thu, Nov-16-2017, 11:57:08 PM   #16
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Default Re: Euro Headers on US Spec E46 M3

For folks wanting to keep cats and the EGT sensor, you need to modify the headers for EGT and either buy a Euro section 1... or have cats added to my current section 1? Trying to figure out the best header option with running all the proper sensors AND cats.
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Old Fri, Nov-17-2017, 12:28:55 AM   #17
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Default Re: Euro Headers on US Spec E46 M3

It's so easy. Euro headers/cats. Extend the rear o2s and plug them along with into the end of the sect 1. Mark your o2 wires with tape.
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Old Fri, Nov-17-2017, 02:13:48 AM   #18
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Default Re: Euro Headers on US Spec E46 M3

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Originally Posted by TboneM3 View Post
It's so easy. Euro headers/cats. Extend the rear o2s and plug them along with into the end of the sect 1. Mark your o2 wires with tape.
Just cut then splice some longer wires of the same gauge? What about the EGT sensor bung, is that present in Euro catted section1? Sorry this has probably been discussed to death and I should just search it.

edit, looks like this old post covers the install/parts. my bad for being lazy.

http://m3forum.net/m3forum/showthread.php?t=116770
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Last edited by binary; Fri, Nov-17-2017 at 02:17:21 AM.
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Old Fri, Nov-17-2017, 04:02:12 AM   #19
TboneM3
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Default Re: Euro Headers on US Spec E46 M3

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Originally Posted by binary View Post
Just cut then splice some longer wires of the same gauge? What about the EGT sensor bung, is that present in Euro catted section1? Sorry this has probably been discussed to death and I should just search it.

edit, looks like this old post covers the install/parts. my bad for being lazy.

http://m3forum.net/m3forum/showthread.php?t=116770
No, you have to unravel the post cat o2s out from under the valve cover and run down the drive side, right of the transmission - look up the DIY.
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/// 2004 SilberGrau M3 · Coupe · 6MT · slicktop · manual seats · no nav______________________JOURNAL

-Evolve-R alpha N · Evolve CSL CF Airbox · eVenturi Scoop · Euro Headers|sect 1 · Besian · D/A pullies/fan delete · WPC rod bearings
-TMS Camber & Subf plates · RE Street Trans Mounts · AKG poly SUB/DIFF · SDW RTAB · ZHP knob + UUC DSSR · GroundControl S/A (Koni/Eibach 440/550) + tall RSMs
-OE CSL trunk · APEX 75mm Studs · Sportline 8S 18x8.5/9.5" · PSS 245/275 · ss brake/clutch lines
-Pioneer DEH-80PRS · Eclipse PA5422 · CDT HD-6 + WS-100i · CDT EX-530 · 8" Kicker

DD/Beater: 1999 Civic LX - Kenwood x998 · PPI 1600.4 · CDT HD-6 + HD-100 · CDT EX-530 · Clarion 10"
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Discussing Euro Headers on US Spec E46 M3 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)