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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, Feb-17-2017, 08:04:50 PM   #1
Obioban
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Default Looking to quiet down the M3 wagon... using section 1 and/or section 2

The muffler can't be used, because there's not many mufflers on the market with M3 IDs, M3 section 2 bolt points, and non M chassis mount points

So, I'm looking to quiet the car down using the mid pipes.

Thoughts? Suggestions? "Too quiet" isn't a thing (quieter better), but I don't want to do anything that'll hurt power.

I'm fine with using the stock catted US headers, so that all available space can be used for muffling.
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Old Fri, Feb-17-2017, 08:11:16 PM   #2
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

Quote:
Originally Posted by Obioban View Post
The muffler can't be used, because there's not many mufflers on the market with M3 IDs, M3 section 2 bolt points, and non M chassis mount points

So, I'm looking to quiet the car down using the mid pipes.

Thoughts? Suggestions? "Too quiet" isn't a thing (quieter better), but I don't want to do anything that'll hurt power.

I'm fine with using the stock catted US headers, so that all available space can be used for muffling.
Since this is custom have you looked in mufflers from other BMW or cars? Maybe a single muffler from e90 M3, M5, M6, with custom brackets to mount to your wagon.

Mid-pipes resonators won't have the same effect as a muffler. You could always try to weld in an vibrant or magnaflow muffler towards your section 1, but section 2 will be tough because of the spacing and bends for anything other then a resonator.
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Old Fri, Feb-17-2017, 08:47:07 PM   #3
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Default Looking to quiet down the M3 wagon... using section 1 and/or section 2

Perhaps a dual in/out magnaflow muffler? Being straight thru it shouldn't influence flow. Use the biggest one you can fit in section 1.

Magnaflow also make dual in/out x-pipe mufflers but I heard that putting an x-pipe in section 1 kills low end power.


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Old Fri, Feb-17-2017, 09:27:24 PM   #4
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

E36 M3 Evo muffler might be a good option.

Another one, if you can stomach it, is the big ass Dynomax Super Turbo.
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Old Fri, Feb-17-2017, 09:28:28 PM   #5
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

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E36 M3 Evo muffler might be a good option.

Another one, if you can stomach it, is the big ass Dynomax Super Turbo.
E36 muffler doesn't share mount points to chassis or section 2. That was my first thought as well.
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Old Fri, Feb-17-2017, 09:37:17 PM   #6
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

not sure what your setup is now but i switched from Supersprint non-res sec2 to their resonated sec2 and it was significantly quieter/more refined

also from experience euro cats are by far the quietest/streetable option compared to all the aftermarket options i've heard
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Old Fri, Feb-17-2017, 09:49:22 PM   #7
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

Any rasp pipe (Rogue, CPI) section 1 with an SS Resonated 2 should be the quietest pair of midpipes. Combined with US catted headers and a heavy muffler, should be quite quiet.
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Old Fri, Feb-17-2017, 09:54:48 PM   #8
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

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Originally Posted by Obioban View Post
E36 muffler doesn't share mount points to chassis or section 2. That was my first thought as well.
Mounting points from muffler to car can be changed and customized. Having the right muffler is the most important part.

If your ok with stock then the Evo or even the e36 euro supersprint muffler can do and just have an exhaust or metal fabrication shop change mounting points.
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Old Fri, Feb-17-2017, 11:12:46 PM   #9
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

The pipe routing going into the muffler is pretty significantly different on the e36 mufflers.
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Old Fri, Feb-17-2017, 11:16:02 PM   #10
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Default Re: Looking to quiet down the M3 wagon... using section 1 and/or section 2

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Originally Posted by WyattH View Post
Any rasp pipe (Rogue, CPI) section 1 with an SS Resonated 2 should be the quietest pair of midpipes. Combined with US catted headers and a heavy muffler, should be quite quiet.
I don't believe you're correct about the section 2-- my M3 became too loud for me with the SS resonated section 2 with the stock muffler-- that's what pushed me to the SS street muffler, to quiet the car down again.

Would that I could run a heavy muffler
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Discussing Looking to quiet down the M3 wagon... using section 1 and/or section 2 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)