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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 Fri, Jul-07-2017, 04:52:58 PM   #571
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Default Re: American Racing Headers for the E46 M3

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Originally Posted by bmw m3 s50 View Post
One thing I would like to add is as everyone probably said - the 3.5" exhaust will be ungodly loud. If the car is a street driven vehicle, I would strongly recommend against it. I have a custom 3.5" for headers back and it ruined my car. My car is supercharged with supersprint non stepped headers. My plan at this point is to use a megan racing mid section pipes as they are the only dual 2.5" exhaust piping on the market that I have found. Magnaflow's exhaust piping is 2.5" but I don't believe it is stainless steel. I am going to make my own custom muffler in the rear that uses dual 2.5" piping. Additionally, I am going to add 100 cell cats and ar25 resonators along with an X-pipe. I am hoping for good results when I head down that road.

Just use a better Muffler - I recommend 1 or 2 Borla XS Pro Systems and a resonator.
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Old Fri, Jul-07-2017, 05:02:57 PM   #572
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Default Re: American Racing Headers for the E46 M3

I don't mind extreme loudness. I actually like it. Call me a child. I just don't want drone while cruising. And yes, you can get one without the other.
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Old Fri, Jul-07-2017, 05:10:54 PM   #573
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Default Re: American Racing Headers for the E46 M3

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Just use a better Muffler - I recommend 1 or 2 Borla XS Pro Systems and a resonator.
Still will not do much in terms of sound compared to separating the exhaust into 2 pipes instead of one.
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Old Fri, Jul-07-2017, 05:31:55 PM   #574
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Default Re: American Racing Headers for the E46 M3

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Originally Posted by bmw m3 s50 View Post
One thing I would like to add is as everyone probably said - the 3.5" exhaust will be ungodly loud. If the car is a street driven vehicle, I would strongly recommend against it. I have a custom 3.5" for headers back and it ruined my car. My car is supercharged with supersprint non stepped headers. My plan at this point is to use a megan racing mid section pipes as they are the only dual 2.5" exhaust piping on the market that I have found. Magnaflow's exhaust piping is 2.5" but I don't believe it is stainless steel. I am going to make my own custom muffler in the rear that uses dual 2.5" piping. Additionally, I am going to add 100 cell cats and ar25 resonators along with an X-pipe. I am hoping for good results when I head down that road.
I've been trying to get the same midpipes but they've been on backorder for ~3 months and counting. If you come across a source, let me know!
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Old Fri, Jul-07-2017, 06:03:59 PM   #575
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Default Re: American Racing Headers for the E46 M3

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So what happened with the members who bought the arh headers? No new dynos?
We are anxiously awaiting the same answers.
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Old Fri, Jul-07-2017, 06:07:43 PM   #576
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Default Re: American Racing Headers for the E46 M3

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Still will not do much in terms of sound compared to separating the exhaust into 2 pipes instead of one.
Says who?
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Old Fri, Jul-07-2017, 06:31:02 PM   #577
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Default Re: American Racing Headers for the E46 M3

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Still will not do much in terms of sound compared to separating the exhaust into 2 pipes instead of one.


There's guys with headers, 1 resonator, and a muffler running 89db at the track. This is a 3.5" system.

So I question your 2 pipe theory


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Old Fri, Jul-07-2017, 06:44:52 PM   #578
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Default Re: American Racing Headers for the E46 M3

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Originally Posted by mdavidm3 View Post
There's guys with headers, 1 resonator, and a muffler running 89db at the track. This is a 3.5" system.

So I question your 2 pipe theory


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Which muffler? I have SSV1s with cats and resonators in the section 1, I would think a decent muffler with 3.5" from section 1 back could be acceptable. If American Racing has a full solution (headers back to muffler) that is doesn't limit power, reduces weight, and isn't crazy loud (could meet db restrictions) I would be all over it.

If I could make the transition from the SSV1s to the AR headers with very little additional cash I would do it. I just swore I would never do headers again.
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Old Fri, Jul-07-2017, 06:47:22 PM   #579
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Default Re: American Racing Headers for the E46 M3

Dynamax super turbo. You can find his thread I the DE section user: s50b30??? Or something like that if I remember correctly

I'm currently running the same and blow 84db (stock headers/resonator/3.5" single pipe system) at laguna seca


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Old Sat, Jul-08-2017, 01:34:55 AM   #580
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Default Re: American Racing Headers for the E46 M3

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Originally Posted by mdavidm3 View Post
There's guys with headers, 1 resonator, and a muffler running 89db at the track. This is a 3.5" system.

So I question your 2 pipe theory


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you could have two resonators with twin pipes which might not affect peak sound level if muffler is basically the same but it will cut down on the drone and crap tones assuming you get more combined volume in the two resonators than a single resonator. it depends what parts you use and how much space you have. ive designed my own custom low height resonator (3.5" height) before to fit my space envelope made a huge difference compared to off the shelf stuff
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Discussing American Racing Headers for the 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)