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      12-09-2012, 02:17 PM   #1
Simon H
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Modifying the standard exhaust ?

Hello Chaps,
I was studying a photo of the internals of the standard exhaust system, in the exhaust thread, and i was wondering, if anyone thought it possible, to modify the F10 M5 silencers, the same way that the E92 M3 exhaust was modded ?. If you cut open the rear silencers, then removed the packing around the baffles, then covered the holes in the pipes, it will effectively become a straight through silencer ?. Just a thought, as the E92 exhaust mod, worked very well, regards, SIMON.
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      01-18-2013, 05:34 PM   #2
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I have been wondering about this same thing myself. I did it on my E92 M3 and absolutely loved the sound. Any thoughts on this?
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      01-18-2013, 06:07 PM   #3
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Not sure you'd gain much as there's pretty much nothing in the stock mufflers .

But if you're happy to donate your mufflers to research give it a try
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      01-18-2013, 08:50 PM   #4
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http://www.m3post.com/forums/showthr...ht=exhaust+mod
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      01-18-2013, 09:17 PM   #5
nv6425
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I did it myself on my E92 and am willing to give it a shot on a donor M5 exhaust, I honestly loved the sound on my M3.

Regarding there not being much in the stock mufflers, the Eisenmann is just cans and is much louder, wouldn't that mean there has to be something inside the stock mufflers to quiet the exhaust down?

I'm truly a novice with this stuff, any help would be appreciated.
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      01-19-2013, 11:17 AM   #6
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here is the inside of the exhaust, don't think there really is much to modify

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      01-19-2013, 12:07 PM   #7
nv6425
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Quote:
Originally Posted by topaz330 View Post
here is the inside of the exhaust, don't think there really is much to modify
Thanks for the pic!

I'm guessing under the sound deadening material is the split to 2 pipes and they are perforated. Any ideas?
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      01-20-2013, 02:25 PM   #8
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Look at the Hartge option. They deleted the mufflers.
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      01-20-2013, 08:29 PM   #9
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Quote:
Originally Posted by topaz330
here is the inside of the exhaust, don't think there really is much to modify

Those definitely look like they can be modified....that material can be removed and maybe put connecting pipes to the two outlets so its more straight through.. Just my opinion
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      01-21-2013, 08:46 AM   #10
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I'm really liking the idea of modifying the stock exhaust. I like the concept of inserting a "Y" junction into the stock muffler. Does anyone have a pic of the stock mufflers opened with that mesh material removed? Any of the tuners willing to give it a try?
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      01-21-2013, 02:55 PM   #11
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If I can find a donor exhaust, I will try it...
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      04-06-2014, 02:10 PM   #12
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      04-07-2014, 10:15 PM   #13
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I believe the competition exhaust is without the bafflers. Its almost too much work if ur paying someone to do it. Deoends what sound u r looking for. Just get a muffler delete.
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      04-27-2014, 12:56 PM   #14
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I have modified the stock mufflers today, took around 3 hours as I had to do it without any help. here's some pics:


Last edited by dapple; 04-27-2014 at 01:04 PM.
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      04-27-2014, 12:57 PM   #15
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      04-27-2014, 01:02 PM   #16
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I removed all of the sound deadening material and found that each muffler had around 2 pints of water in, maybe even more. Had to drill a small drain hole and then close it up with a tiny tig weld.

The sound is good, has a lot more rasp and crackle. No drone inside the car and volume I would say is about 15-20% louder outside the car. Can't test it under load yet as it's been raining all day but will post a video soon....

Last edited by dapple; 04-27-2014 at 01:08 PM.
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      04-27-2014, 01:03 PM   #17
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      04-27-2014, 01:03 PM   #18
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M5 exhaust sound deadening removed:
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      05-01-2014, 08:38 AM   #19
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Quote:
Originally Posted by dapple View Post
I removed all of the sound deadening material and found that each muffler had around 2 pints of water in, maybe even more. Had to drill a small drain hole and then close it up with a tiny tig weld.
Brave work, thanks! It does sound more dynamic without that little bit of packing. If the muffler position leads to water accumulation maybe the small drain hole would be something to leave in place? Motorcycles have that small drain hole in the low spot in the exhaust to get rid of the water. Doubt it has any negative effect, and lets the water escape.
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      05-01-2014, 11:27 AM   #20
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turner.
many said it doesn't gain power..
but it did. i believe it did *placeboooo
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      05-01-2014, 11:43 AM   #21
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Quote:
Originally Posted by dapple View Post
I removed all of the sound deadening material and found that each muffler had around 2 pints of water in, maybe even more. Had to drill a small drain hole and then close it up with a tiny tig weld.

The sound is good, has a lot more rasp and crackle. No drone inside the car and volume I would say is about 15-20% louder outside the car. Can't test it under load yet as it's been raining all day but will post a video soon....
Amazing, how the heck can I do this myself? I am the most unhandy person around.. any instructions I can take to a wielder or body shop? This is exactly what I am looking for - only other option is to go 7k+ on a Akra exhaust!
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      05-01-2014, 12:31 PM   #22
bobblehead
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couple of places can do this mod

https://www.facebook.com/Centerlinemotorsports


https://www.facebook.com/streetxtremeautomotive



Quote:
Originally Posted by uhn2000 View Post
Amazing, how the heck can I do this myself? I am the most unhandy person around.. any instructions I can take to a wielder or body shop? This is exactly what I am looking for - only other option is to go 7k+ on a Akra exhaust!
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