THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Make the exhaust louder - center exhaust/DP?

Post Reply
 
Thread Tools Search this Thread
      07-06-2014, 04:23 AM   #1
Skardy
New Member
Luxembourg
2
Rep
6
Posts

Drives: M235i
Join Date: May 2014
Location: Luxembourg

iTrader: (0)

Make the exhaust louder - center exhaust/DP?

Hello everyone,

I already have the MPE fitted, but I think the car is still too quiet (at least from the inside).

I was thinking to make it louder with a catless DP, but I don't really want the engine warning turned on all the time.
Is JB4 the only way to clear it? The problem with JB4 its that it voids warranty and insurance in Luxembourg.

The alternative I thought of is to replace the center muffler with a straight pipe like this one:
http://www.supersprint.com/en/IT/pro...093E280BA.aspx

Anyone has any experience w/o the center muffler?
Does it require cutting the exhaust?
Any louder?

Thanks for your answers
Appreciate 0
      07-06-2014, 07:16 AM   #2
Delnari
Major
Delnari's Avatar
United_States
255
Rep
1,040
Posts

Drives: 2014 MG F22 Auto
Join Date: Mar 2010
Location: Alexandria, VA

iTrader: (2)

The mid-pipe has a "resonator" that helps the exhaust pulses stabilize to keep proper back pressure to the rear muffler. You can remove it and it will increase the sound of the exhaust as the pulses will travel back to the muffler without being smooth out. Remember the factory exhaust is engineered to not only produce sound, but to efficiently move exhaust gases out of the car. Cutting and changing a factory exhaust is not recommended as you are disrupting the designed purpose.

The reason why full exhaust systems are so expensive (the good ones) is because they are engineered to provide a certain level of sound and still be able to do the job of keeping the proper exhaust frequency in the piping. When you change this without the correct engineering you make exhaust exit less efficient and resulting in poorer performance. A louder exhaust is not sign of a better system, but a properly done full exhaust system tuned to make the noise is.
Appreciate 0
      07-07-2014, 10:47 AM   #3
cbbplanet
First Lieutenant
28
Rep
319
Posts

Drives: space shuttle
Join Date: Jul 2011
Location: Taipei

iTrader: (5)

Quote:
Originally Posted by Skardy View Post
Hello everyone,

I already have the MPE fitted, but I think the car is still too quiet (at least from the inside).

I was thinking to make it louder with a catless DP, but I don't really want the engine warning turned on all the time.
Is JB4 the only way to clear it? The problem with JB4 its that it voids warranty and insurance in Luxembourg.

The alternative I thought of is to replace the center muffler with a straight pipe like this one:
http://www.supersprint.com/en/IT/pro...093E280BA.aspx

Anyone has any experience w/o the center muffler?
Does it require cutting the exhaust?
Any louder?

Thanks for your answers
Technically.. modifying the exhaust will void your BMW warranty/insurance as well.. but if you're worried, you can always do Cobb Tuning to get rid of CEL as well instead of jb4. Or if you wait, maybe BT Tool will roll out with an update that can code out the error.
Appreciate 0
      07-07-2014, 02:20 PM   #4
Skardy
New Member
Luxembourg
2
Rep
6
Posts

Drives: M235i
Join Date: May 2014
Location: Luxembourg

iTrader: (0)

Quote:
Originally Posted by cbbplanet View Post
Technically.. modifying the exhaust will void your BMW warranty/insurance as well..
Not here.
Exhaust mods are considered "illegal sound improvement": they don't change the car's dynamics and therefore the insurance is still valid.
JB4 will be seen as a "performance improvement" which leads to a power that is higher than the one on car's papers (and therefore insured).

Could you please tell me more about Cobb Tuning and BT Tool?
I thought Cobb was a ECU attachment like JB4.
BT Tool, I've never heard of
Appreciate 0
      07-08-2014, 12:47 PM   #5
AnooooOH
Major
Germany
169
Rep
1,215
Posts

Drives: M235i
Join Date: May 2009
Location: Germoney

iTrader: (0)

you can get a catted downpipe which will not throw a code at manhart e.g.
so you won`t need a jb4.

I`m getting a catted downpipe and a decatted midpipe next week.
__________________

MANHART MH2 400 Partout
FS: MANHART MHtronik Tuning Box
http://www.2addicts.com/forums/showt...5#post18819345
Appreciate 0
      07-08-2014, 01:17 PM   #6
DanG
Major General
DanG's Avatar
United_States
10447
Rep
6,879
Posts

Drives: 2018 M2 AW DCT
Join Date: Aug 2012
Location: Seattle, WA

iTrader: (1)

Garage List
2018 BMW M2  [7.68]
I guess I am getting too old. I find the MPE too loud as it is. I can't imagine wanting something louder.
Appreciate 0
      07-08-2014, 01:42 PM   #7
cbbplanet
First Lieutenant
28
Rep
319
Posts

Drives: space shuttle
Join Date: Jul 2011
Location: Taipei

iTrader: (5)

Quote:
Originally Posted by Skardy View Post
Not here.
Exhaust mods are considered "illegal sound improvement": they don't change the car's dynamics and therefore the insurance is still valid.
JB4 will be seen as a "performance improvement" which leads to a power that is higher than the one on car's papers (and therefore insured).

Could you please tell me more about Cobb Tuning and BT Tool?
I thought Cobb was a ECU attachment like JB4.
BT Tool, I've never heard of
No I believe Cobb uses something called accessport. However, just emailed Cobb and they haven't done a tune for M235i yet.

BT Tool is what a lot of shops used to detect the CEL/error codes and it'll define exactly the cause of it is. It can also tell the car to ignore those errors such as TPMS, catless, etc... However, the newer cars have a slight different computer encryption so last time the shop tried, BT Tool don't have that function.
Here's more information on it: http://www.bavariantechnic.com/

ALSO, there's another way that's not guaranteed to work. Its called a o2 sensor spacer. Its cheap and worth a try but sometimes it'll work and sometimes won't. Basically it tries to create enough room that the computer might or might not sense the cat is missing. something like this http://www.ebay.com/itm/like/281130517128?lpid=82
Appreciate 0
      07-08-2014, 02:02 PM   #8
Skardy
New Member
Luxembourg
2
Rep
6
Posts

Drives: M235i
Join Date: May 2014
Location: Luxembourg

iTrader: (0)

Quote:
Originally Posted by AnooooOH View Post
I`m getting a catted downpipe and a decatted midpipe next week.
There's an additional cat on the midpipe?
So decatting this one wouldn't throw a CEL?


How much does the manhart (sport?) cat costs?
I saw Supersprint's sport cat, but it's 1500+ €
Appreciate 0
      07-08-2014, 02:05 PM   #9
Skardy
New Member
Luxembourg
2
Rep
6
Posts

Drives: M235i
Join Date: May 2014
Location: Luxembourg

iTrader: (0)

Quote:
Originally Posted by DanG View Post
I guess I am getting too old. I find the MPE too loud as it is. I can't imagine wanting something louder.
I think the MPE is perfect between 1500-2500 revs.
But it failed the "tunnel test", which is full throttle 4000-7000 revs in 3rd gear in a tunnel: I could only hear the wind...
Appreciate 0
      07-08-2014, 02:20 PM   #10
alz0rz
What goes here?
alz0rz's Avatar
450
Rep
1,356
Posts

Drives: 2019 G30 M550i
Join Date: Aug 2011
Location: Florida Space Coast

iTrader: (4)

Garage List
Quote:
Originally Posted by Skardy View Post
I think the MPE is perfect between 1500-2500 revs.
But it failed the "tunnel test", which is full throttle 4000-7000 revs in 3rd gear in a tunnel: I could only hear the wind...
Completely agree... the burping on downshift/off-throttle is awesome, and it sounds great when revved standing still but in a tunnel or just some bursts of fun on the highway and you can barely hear it over the wind, if at all. And no, I am not talking about how it sounds inside the car, a lot of that is pumped through to us through the Active Sound stuff.
__________________
2019 G30 M550i

GBNF:
2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
Appreciate 0
      07-08-2014, 02:20 PM   #11
cbbplanet
First Lieutenant
28
Rep
319
Posts

Drives: space shuttle
Join Date: Jul 2011
Location: Taipei

iTrader: (5)

Quote:
Originally Posted by Skardy View Post
There's an additional cat on the midpipe?
So decatting this one wouldn't throw a CEL?


How much does the manhart (sport?) cat costs?
I saw Supersprint's sport cat, but it's 1500+ €
No, decat anything will throw a CEL. that's what your o2 sensor is there for. To detect if any cats is missing.

PS. anything with a cat will sound a lot more conservative if sound is what you're going for.
Appreciate 0
      07-08-2014, 03:55 PM   #12
escobar929
Brigadier General
escobar929's Avatar
154
Rep
4,528
Posts

Drives: M2 CS
Join Date: Aug 2009
Location: Hollywood, FL

iTrader: (14)

Garage List
2020 M2 CS  [10.00]
2020 M240i  [0.00]
also keep in mind that the cats are there to remove the smell so if you get catless downpipes, you will have a significant smell. but its not too bad, most people can live w/ it but its something to consider
Appreciate 0
      07-09-2014, 03:00 AM   #13
AnooooOH
Major
Germany
169
Rep
1,215
Posts

Drives: M235i
Join Date: May 2009
Location: Germoney

iTrader: (0)

Quote:
Originally Posted by Skardy View Post
There's an additional cat on the midpipe?
So decatting this one wouldn't throw a CEL?


How much does the manhart (sport?) cat costs?
I saw Supersprint's sport cat, but it's 1500+ €
yes, there is an additional cat like it was on the n54.
and when you get rid of the cat on the midpipe, it will NOT throw a code.
same thing on the n54.

Like I said, my parts should arrive on monday and will be installed on friday.

the manhart is cheaper. If you like I`ll pass you a contact.

Quote:
Originally Posted by cbbplanet View Post
No, decat anything will throw a CEL. that's what your o2 sensor is there for. To detect if any cats is missing.

PS. anything with a cat will sound a lot more conservative if sound is what you're going for.
That`s not true. Not on the midpipe. Just when you get a catless downpipe.
__________________

MANHART MH2 400 Partout
FS: MANHART MHtronik Tuning Box
http://www.2addicts.com/forums/showt...5#post18819345
Appreciate 0
      07-09-2014, 09:58 AM   #14
dharo1
Captain
dharo1's Avatar
United_States
215
Rep
661
Posts

Drives: Previous: F22 M235i ; F80 M3 ;
Join Date: Mar 2014
Location: El Paso, Texas

iTrader: (1)

Quote:
Originally Posted by AnooooOH
Quote:
Originally Posted by Skardy View Post
There's an additional cat on the midpipe?
So decatting this one wouldn't throw a CEL?


How much does the manhart (sport?) cat costs?
I saw Supersprint's sport cat, but it's 1500+
yes, there is an additional cat like it was on the n54.
and when you get rid of the cat on the midpipe, it will NOT throw a code.
same thing on the n54.

Like I said, my parts should arrive on monday and will be installed on friday.

the manhart is cheaper. If you like I`ll pass you a contact.

Quote:
Originally Posted by cbbplanet View Post
No, decat anything will throw a CEL. that's what your o2 sensor is there for. To detect if any cats is missing.

PS. anything with a cat will sound a lot more conservative if sound is what you're going for.
That`s not true. Not on the midpipe. Just when you get a catless downpipe.
Interested in Manhart's catted downpipe...would you pass that contact? Thanks
Appreciate 0
      07-09-2014, 02:14 PM   #15
AnooooOH
Major
Germany
169
Rep
1,215
Posts

Drives: M235i
Join Date: May 2009
Location: Germoney

iTrader: (0)

Quote:
Originally Posted by dharo1 View Post
Interested in Manhart's catted downpipe...would you pass that contact? Thanks
pm
__________________

MANHART MH2 400 Partout
FS: MANHART MHtronik Tuning Box
http://www.2addicts.com/forums/showt...5#post18819345
Appreciate 0
      07-09-2014, 02:55 PM   #16
Skardy
New Member
Luxembourg
2
Rep
6
Posts

Drives: M235i
Join Date: May 2014
Location: Luxembourg

iTrader: (0)

Quote:
Originally Posted by AnooooOH View Post
yes, there is an additional cat like it was on the n54.
and when you get rid of the cat on the midpipe, it will NOT throw a code.
same thing on the n54.
0

the manhart is cheaper. If you like I`ll pass you a contact.
Sound interesting. By mid pipe, are you speaking of what I called "resonator"?
Otherwise, where is this midpipe cat?

Pm for manhart catted DP and for midpipe decat if possible

Thanks
Appreciate 0
      07-10-2014, 02:18 AM   #17
AnooooOH
Major
Germany
169
Rep
1,215
Posts

Drives: M235i
Join Date: May 2009
Location: Germoney

iTrader: (0)

Quote:
Originally Posted by Skardy View Post
Sound interesting. By mid pipe, are you speaking of what I called "resonator"?
Otherwise, where is this midpipe cat?

Pm for manhart catted DP and for midpipe decat if possible

Thanks
yes!

sorry, I don`t know all the english terms!

I`ll shoot you a pm!
__________________

MANHART MH2 400 Partout
FS: MANHART MHtronik Tuning Box
http://www.2addicts.com/forums/showt...5#post18819345
Appreciate 0
      07-22-2014, 05:59 PM   #18
SJL
Enlisted Member
6
Rep
37
Posts

Drives: BMW M235i F22
Join Date: Jul 2014
Location: Singapore

iTrader: (0)

I'm using a BMS Canbus tool to clear the fault code every now and then .

Actually u can just go with a 200cell downpipe with integrated O2 Bung, u get sound and no fault code .
Appreciate 0
Post 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



All times are GMT -5. The time now is 06:03 AM.




2addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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