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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-24-2012, 07:02 PM   #1
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Join Date: Aug 2012
Location: BC
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My Ride: 03 M3
e46 M3 Euro header vs other aftermarket

I've been doing some searching around for the right header setup for me. I'm going to be running catless as well.

Specs : If I'm going catless does it matter whether I run OEM Euro headers or something like AP? Flow / diameter should net similar hp gains?

Here's my dilemma :

Status gruupe : $810
Agency Power : $890
Euro header : $620

Price wise and fitment the best choice looks like OEM Euro - cat-less.

From what I've read I can't seem to find anyone running euro headers without cats in section 1. If the HP gains will be about the same for any headers running cat-less then I will go after the Euro units.

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Old 10-30-2012, 10:07 AM   #2
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Would also be interested in including SS stepped headers into this mix for comparison sake.
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Old 10-31-2012, 07:43 AM   #3
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Do you live in the area of BC that has no bi-annual emissions testing? If not, running no cats would not be a wise thing to do. For example, on the freeway, I was following another cat free M3 that was maybe 100 to 150 yards in front of from me, and on this relatively open stretch of freeway, I could smell his hydrocarbon laden exhaust. It's your own choice to make yourself "cop (police) bait", but the smart play is not to.

Now that I think about it, do Canadian M3s even run the same exhaust as M3s in the United States? I would think Canadian and U.S. M3s would be using different exhausts. You should check to see where the cats are located in your Canadian M3. You already may be running a set of euro headers.

Last edited by lucky_doggg7; 10-31-2012 at 10:20 AM.
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