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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 Mon, Mar-20-2017, 12:42:49 AM   #411
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread and my DIY

Internals are done. Ready to button it up again.


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Old Mon, Mar-20-2017, 12:46:32 AM   #412
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

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Originally Posted by nasieg View Post
Coincidence that this thread is getting bumped again. I just got an update on my muffler. A friend of mine (who is an awesome fabricator)is eliminating chambers 3-5 for me. I wanted it to be done cleanly and his work never disappoints.



Looking forward to hearing what this will sound like


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Damn that is good work. I'm guessing the stealth rear box is the whole plan? Without any perforations in the pipe and packing, that is going to be quite loud.
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Old Mon, Mar-20-2017, 12:52:00 AM   #413
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

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Damn that is good work. I'm guessing the stealth rear box is the whole plan? Without any perforations in the pipe and packing, that is going to be quite loud.
I can't take credit for the work itself. The guy that is doing it builds Ultra 4 competition cars for a living.

If you follow this thread, it seems that straight piping chambers 3-5, does not result in huge noise increase. It seems that packing chambers 1&2 do more of that, so for now I left those alone and will see how I like this.
I have euro headers and section 1 and am really not far from pleased with the stock muffler. A couple more db's and more racy sound is all I want. If it wasn't for the price, I'd get a SS street or sport, but $1500 just seems like a lot for a stupid muffler.
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Old Mon, Mar-20-2017, 04:43:45 AM   #414
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread and my DIY

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Great work, that's basically perfect IMO


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Old Mon, Mar-20-2017, 05:37:24 AM   #415
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

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Hey guys don't know if this has been mentioned yet, but stainless steel wool is the shiz-nit packing. I forewent repacking the stock muffler and decided to tackle my Megan race exhaust that had been sitting in the garage for about 2 years (reluctant to put it on after listening to you tube vids, YUKE).

Anyway, I pulled all the fiberglass matting out of the canisters and repacked with COARSE Stainless Steel Wool, 5lb Roll. Promise I'll get a sound vid up, but the SS wool attenuates sound soooooo much better than rock wool or fiberglass. It will significantly cut down on the high freq's, giving a much much deeper sound. Plus the stuff will last pretty much forever, not blowing out or significantly degrading over time.
Hi Brian,
I was wondering how much stainless steel wool did you use? Which chambers did you repack? How did it sound, more raspy or less?
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Old Mon, Mar-20-2017, 01:13:11 PM   #416
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

Thanks guys

Keep in mind this isn't the stock gutted muffler, rather a Megan Race exhaust. I used just shy of half the roll per canister; Cut in 6-ft lengths, loosely rolled/balled-up, & packed into the canisters fairly tight.

Just want to reiterate, make sure you're using stainless and not just regular steel wool. This stuff should last the life of your muffler and not blow-out, or change sound significantly, once it's got a good glaze of carbon.


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Nice man! I will be opening mine again (for the tenth time) and use this to pack section 1 and 2. Sounds like it cleans up some the harsher tones.
Do you have stock headers?
@icecream:
I definitely don't have symphony maestro ears, but in person you can tell there's sort of a unique sound with the SS wool. Something about the weight compared to fiber, how it vibrates and attenuates certain freq's. A lot of the upper echelon bike exhausts use SS wool or some synthetic textile that take like 5k; that's really where I got the idea.
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Old Wed, Mar-22-2017, 03:02:01 AM   #417
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Default Gutting stock E46 M3 muffler discussion/compilation thread

I got my stock gutted (eliminated chambers 3-5) muffler installed.
The results are positive. I only went for a brief drive, letting the car get to operating temp, so I could rev'd up a bit and give it a couple of test runs through the rpm range.

I noticed immediately after starting the engine, that the note was noticeable deeper, but not significantly louder. Just a nicer fuller and deeper burble.
Once you step on it, the deeper rumble fades a bit as it gains the higher pitch of the stock muffler back, and I want to say it might have lost a bit of the rasps. If I had to compare the sound to any of the aftermarket mufflers I am familiar with, I would compare it to the Dinan or A/C Schnitzer muffler sound.

I have to say I am pleased. It's just a hair louder, but deeper and more purposeful and about 5lbs lighter than before and did not cost me a whole lot.

I took a video with my iPhone. Not the best representation, but better than nothing. I will upload it shortly.




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Last edited by nasieg; Wed, Mar-22-2017 at 03:07:48 AM.
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Old Wed, Mar-22-2017, 07:49:51 AM   #418
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

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Originally Posted by SliM3 View Post
I definitely don't have symphony maestro ears, but in person you can tell there's sort of a unique sound with the SS wool. Something about the weight compared to fiber, how it vibrates and attenuates certain freq's. A lot of the upper echelon bike exhausts use SS wool or some synthetic textile that take like 5k; that's really where I got the idea.
interesting, i was going to ask about this as i would have sworn i read not to use SS Wool in high heat areas. i recall that SuperSprint uses a high heat rock wool just for this reason. but good to know.
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Old Wed, Mar-22-2017, 08:13:38 AM   #419
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread

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Originally Posted by nasieg View Post
I got my stock gutted (eliminated chambers 3-5) muffler installed.
The results are positive. I only went for a brief drive, letting the car get to operating temp, so I could rev'd up a bit and give it a couple of test runs through the rpm range.

I noticed immediately after starting the engine, that the note was noticeable deeper, but not significantly louder. Just a nicer fuller and deeper burble.
Once you step on it, the deeper rumble fades a bit as it gains the higher pitch of the stock muffler back, and I want to say it might have lost a bit of the rasps. If I had to compare the sound to any of the aftermarket mufflers I am familiar with, I would compare it to the Dinan or A/C Schnitzer muffler sound.

I have to say I am pleased. It's just a hair louder, but deeper and more purposeful and about 5lbs lighter than before and did not cost me a whole lot.

I took a video with my iPhone. Not the best representation, but better than nothing. I will upload it shortly.


https://youtu.be/QKoG6hFNAi8


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Wow, that sounds pretty nice, especially up higher in the revs. Nice and clean sounding, probably not a ton louder than stock but no rasp really. Looks good!
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Old Thu, Apr-06-2017, 02:36:08 AM   #420
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Default Re: Gutting stock E46 M3 muffler discussion/compilation thread and my DIY

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Sounds fantastic! Any drone?
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Discussing Gutting stock E46 M3 muffler discussion/compilation thread 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)