E90Post
 


VIBE Motorsports
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 335i muffler in detail



Reply
 
Thread Tools Search this Thread
      04-12-2009, 08:44 AM   #1
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

335i muffler in detail

So yesterday,I and a friend of mine decided to use the spare time to look inside the 335i muffler

We carefully unmounted the whole exhaust up to the pipes that lead to the downpipes.
Then we cut it open and well,it was quite suprising how simple the muffler was constructed.
But one thing was quite weird...
In the left muffler,there is a small section that looks like a cat.
So we looked through the exhaust tips using a flashlight and found catalytic material inside as well as any insulating material if it was used as a small extra muffler.
So what is this thing good for?
Another thing I was wondering is : what is the connecting pipe between the two seperate mufflers good for?
Maybe to get a better flow if one muffler seems to "clog" or has a less good exhaust stream flow..

here are some pics to see what I`m talkin about
Attached Images
      
Appreciate 0
      04-12-2009, 09:01 AM   #2
boostin4fun
Banned
7

 
Drives: BMW 335i CP
Join Date: Apr 2009
Location: USA


Posts: 228
iTrader: (2)

Wow. This has been done before by Mr. 5 I believe
Appreciate 0
      04-12-2009, 09:05 AM   #3
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

Quote:
Originally Posted by boostin4fun View Post
Wow. This has been done before by Mr. 5 I believe
Yes,the last 2 pics are actually someone else`s pics.
Since I didn`t take any of the left muffler part I simply took those 2 pics from his thread.
Appreciate 0
      04-12-2009, 09:05 AM   #4
ppatel223
Banned
23

 
Drives: F10 I3.0
Join Date: Jan 2009
Location: AR


Posts: 374
iTrader: (0)

woahh, dissecting muffler?? I think the cat on left side helps with emission when car is cold, because only left side is open when cold, and to help cat get hot faster. now dissect the motor and see what do you find interesting there? lol
Appreciate 0
      04-12-2009, 09:44 AM   #5
ianthegreat
Colonel
40

 
ianthegreat's Avatar
 
Drives: n54
Join Date: Apr 2008
Location: Pittsburgh/Houston


Posts: 2,314
iTrader: (1)

nice
Appreciate 0
      04-12-2009, 09:58 AM   #6
thread killer
Banned
16

 
Drives: faster then your car
Join Date: Nov 2008
Location: pulling away


Posts: 472
iTrader: (3)

looks like someone has klinker tile..... dealer tech! (mr.5?)
Appreciate 0
      04-12-2009, 02:10 PM   #7
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

Quote:
Originally Posted by ppatel223 View Post
woahh, dissecting muffler?? I think the cat on left side helps with emission when car is cold, because only left side is open when cold, and to help cat get hot faster. now dissect the motor and see what do you find interesting there? lol
do you really think it`s a cat?

We looked inside the left tip with a flashlight and did not see any material inside
Appreciate 0
      04-12-2009, 03:20 PM   #8
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

I read somewhere that the connecting pipe is acting as a resonator..
is that correct?

Does the E93 have a resonator before the muffler section?
Appreciate 0
      04-12-2009, 03:22 PM   #9
Malek@MRF
Brigadier General
United_States
93

 
Malek@MRF's Avatar
 
Drives: E92 M3, E46 M3, F30, E30
Join Date: Jan 2008
Location: Irvine, California


Posts: 3,392
iTrader: (5)

Send a message via AIM to Malek@MRF
Quote:
Originally Posted by ebeem View Post
I read somewhere that the connecting pipe is acting as a resonator..
is that correct?

Does the E93 have a resonator before the muffler section?
The connecting pipe is basically an integrated "H-Pipe". Designed to cancel out certain unwanted frequencies in a factory car.
__________________

BMW PERFORMANCE SPECIALISTS. Suspension. Forced Induction. Brakes. Race Preparation. Service. Alignments.
OFFICIAL PARTNERS: Íhlins. KW Suspension. Brembo. AP Racing. ESS Tuning. iND Distribution. Turner Motorsport.
Facebook | Instagram | Yelp! | Flikr | Contact | YouTube
Appreciate 0
      04-12-2009, 03:48 PM   #10
sd390r
Lieutenant Colonel
United_States
53

 
sd390r's Avatar
 
Drives: AW M3
Join Date: Aug 2008
Location: North Jersey


Posts: 1,657
iTrader: (9)

Garage List
2008 E90 335i  [0.00]
someone should do this with an AE muffler
Appreciate 0
      04-12-2009, 03:54 PM   #11
SoCalTech
Captain
United_States
6

 
Drives: Not a BMW yet...
Join Date: Oct 2008
Location: Redondo Beach, Ca


Posts: 649
iTrader: (0)

The left exhaust tip get's closed off by the exhaust flap. The exhaust in that pipe needs to have somewhere to go, so they route it over to the other side.
Appreciate 0
      04-12-2009, 04:27 PM   #12
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

Quote:
Originally Posted by SoCalTech View Post
The left exhaust tip get's closed off by the exhaust flap. The exhaust in that pipe needs to have somewhere to go, so they route it over to the other side.
Yes that makes sense of course.
But what is this cat-like thing inside the left exhaust?

another thing :

is that correct ? :
Attached Images
 
Appreciate 0
      04-12-2009, 07:38 PM   #13
thread killer
Banned
16

 
Drives: faster then your car
Join Date: Nov 2008
Location: pulling away


Posts: 472
iTrader: (3)

it cant be a cat any ways. its too far down the exhaust stream to ever get hot enough. its just something to keep it quieter.....
Appreciate 0
      04-12-2009, 08:03 PM   #14
jadeddjay
Major
United_States
56

 
jadeddjay's Avatar
 
Drives: e92 335i
Join Date: Oct 2005
Location: jackson, ms


Posts: 1,426
iTrader: (4)

Garage List
2007 e92 335i  [0.00]
maybe thats what the flap is for?
Appreciate 0
      04-13-2009, 10:39 AM   #15
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

hmm anybody?
Appreciate 0
      04-13-2009, 10:42 AM   #16
jadeddjay
Major
United_States
56

 
jadeddjay's Avatar
 
Drives: e92 335i
Join Date: Oct 2005
Location: jackson, ms


Posts: 1,426
iTrader: (4)

Garage List
2007 e92 335i  [0.00]
i think what you said is a resonator is actually just a Y pipe. if you found catalytic material in the drivers side muffler, chances are, its a cat. the exhaust flap closes to heat it up and opens when youre on throttle.

upstream to the Y pipe are the secondary cats and the primary cats are in the downpipe upstream to that.
Appreciate 0
      04-13-2009, 11:39 AM   #17
thegeneral101
Colonel
United_States
52

 
Drives: '13 M3 LRE,'13 750Li
Join Date: Nov 2006
Location: Miami/Michigan


Posts: 2,302
iTrader: (0)

Quote:
Originally Posted by thread killer View Post
it cant be a cat any ways. its too far down the exhaust stream to ever get hot enough. its just something to keep it quieter.....
correct
__________________
Appreciate 0
      04-13-2009, 01:06 PM   #18
Malek@MRF
Brigadier General
United_States
93

 
Malek@MRF's Avatar
 
Drives: E92 M3, E46 M3, F30, E30
Join Date: Jan 2008
Location: Irvine, California


Posts: 3,392
iTrader: (5)

Send a message via AIM to Malek@MRF
Quote:
Originally Posted by thread killer View Post
it cant be a cat any ways. its too far down the exhaust stream to ever get hot enough. its just something to keep it quieter.....
that's correct.
__________________

BMW PERFORMANCE SPECIALISTS. Suspension. Forced Induction. Brakes. Race Preparation. Service. Alignments.
OFFICIAL PARTNERS: Íhlins. KW Suspension. Brembo. AP Racing. ESS Tuning. iND Distribution. Turner Motorsport.
Facebook | Instagram | Yelp! | Flikr | Contact | YouTube
Appreciate 0
      04-13-2009, 04:00 PM   #19
ebeem
First Lieutenant
Germany
10

 
ebeem's Avatar
 
Drives: E93 335i M - Paket
Join Date: Jul 2007
Location: Munich,Germany


Posts: 325
iTrader: (0)

ok thanks

so my idea is to make straight pipes from the downpipes by cutting out the secondary cats and replacing them by 2 pipes and then in the muffler I would have to close the bypass pipes with a metal plate on each side and for the left muffler I`ll have to replace the small muffler inside by a single pipe.
This way the german cops should not be able to see that I have no mufflers and I still can drive with straight pipes

is that correct?

Thanks guys,I really appreciate your input!
Appreciate 0
      04-13-2009, 04:03 PM   #20
jadeddjay
Major
United_States
56

 
jadeddjay's Avatar
 
Drives: e92 335i
Join Date: Oct 2005
Location: jackson, ms


Posts: 1,426
iTrader: (4)

Garage List
2007 e92 335i  [0.00]
you may even be able to pick up more power without that y-pipe, since youre already taking stuff out.

good luck, i hope it sounds to your likeing when its all done
Appreciate 0
      04-13-2009, 04:09 PM   #21
inthemiddle
Lieutenant
18

 
Drives: BMW
Join Date: Jul 2007
Location: Somewhere


Posts: 467
iTrader: (2)

Quote:
Originally Posted by ebeem View Post
This way the german cops should not be able to see that I have no mufflers and I still can drive with straight pipes

is that correct?
Don't ya think they might hear it ???
Appreciate 0
      04-13-2009, 04:47 PM   #22
marconi118
Captain
31

 
Drives: 06/07 e93 335i
Join Date: Nov 2008
Location: europe


Posts: 967
iTrader: (0)

E93 has exact the same exhaust as E92.
The E90 has a resonator in the X pipe, so it is less loud.

The passenger side muffler contains big resonator so it is quiet.
The drivers side muffler contains this kind of cat, in fact it is a small resonator that gives the nice sound when the flap is open.

I whould subjest only to remove the rock wool inside the mufflers, and close them.
It should give a nice sound
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 10:19 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST