E90Post
 


The Tire Rack
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Silencer options for a Cobb Catback?



Reply
 
Thread Tools Search this Thread
      11-02-2015, 04:36 PM   #1
Team503
Nerd
Ireland
130
Rep
437
Posts

Drives: 2009 335i Sport/Auto/Luxury
Join Date: Jul 2013
Location: Dublin

iTrader: (5)

Silencer options for a Cobb Catback?

I love the sound of my recently installed Cobb, but there's a bit of a drone on the highway, and some days, I really just don't feel like hearing loud exhausts (*cough*hangover*cough*)

I remember back in my munchkin-sized days, I have a 5Zigen exhaust on my Civic Si, and it came with a slip-in silencer device that dramatically lowered the noise levels.

Can anyone suggest a solution that doesn't involve cut'n'weld? I may look at a change of the whole setup later on, but I'm looking for a more immediate solution..

Thanks!
__________________
2009 E92 335i Sport 6AT - Finished, sold
Transport for Ireland - LEAP Pass with TFI smartapp because cars are stupid expensive in Ireland
Appreciate 0
      11-02-2015, 06:18 PM   #2
dbworld4k
Banned
Canada
591
Rep
2,233
Posts

Drives: '12 M3
Join Date: Mar 2008
Location: YYZ

iTrader: (5)

Garage List
2002 BMW M5  [10.00]
2009 BMW 335i  [10.00]
Sounds like you need a electronic bypass equipped system.
Appreciate 0
      11-02-2015, 07:12 PM   #3
berns
Captain
1628
Rep
682
Posts

Drives: '07 E90 335i
Join Date: Feb 2013
Location: Los Angeles, CA

iTrader: (1)

sounds like you should have kept a stock exhaust on there. I have the cobb with catless dp's and never find it to be too loud or droning, so if you're that sensitive to it, time for stock. those slip in silencers are a terrible idea, especially for a turbocharged car.
Appreciate 1
      11-02-2015, 07:16 PM   #4
Team503
Nerd
Ireland
130
Rep
437
Posts

Drives: 2009 335i Sport/Auto/Luxury
Join Date: Jul 2013
Location: Dublin

iTrader: (5)

Quote:
Originally Posted by berns View Post
<snip> those slip in silencers are a terrible idea, especially for a turbocharged car.
Why so? Obviously they restrict airflow, but my goal is to reduce volume, and that requires restricting airflow. Won't be worse than stock, I would think.

In the long run, I'd like to find an iPE system, but they're pricey and I don't really know if I can justify the cost. I have another project that's taking priority. I would hate to go back to stock if a silencer - or something similar - will work.
__________________
2009 E92 335i Sport 6AT - Finished, sold
Transport for Ireland - LEAP Pass with TFI smartapp because cars are stupid expensive in Ireland
Appreciate 0
      12-02-2015, 07:23 PM   #5
berns
Captain
1628
Rep
682
Posts

Drives: '07 E90 335i
Join Date: Feb 2013
Location: Los Angeles, CA

iTrader: (1)

Quote:
Originally Posted by Team503 View Post
Why so? Obviously they restrict airflow, but my goal is to reduce volume, and that requires restricting airflow. Won't be worse than stock, I would think.

In the long run, I'd like to find an iPE system, but they're pricey and I don't really know if I can justify the cost. I have another project that's taking priority. I would hate to go back to stock if a silencer - or something similar - will work.
restricting volume doesn't mean restricting flow. You can add an additional muffler or resonator if you're so inclined, without sticking a cork in the tail pipe.
Appreciate 1
      12-03-2015, 08:40 AM   #6
Stucks
Lieutenant Colonel
Stucks's Avatar
United_States
180
Rep
1,911
Posts

Drives: 2017 F30 340i Xdrive
Join Date: Oct 2010
Location: Montgomery County, MD

iTrader: (12)

Put a 50 or 100 cell high flow cat in it. It wont restrict flow all that much, and it will kill some of the sound.

http://mandrelbendingsolutions.com/m...ace-converter/
__________________
Current: 2017 F30 340i xdrive
Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost.
Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
Appreciate 0
      12-03-2015, 10:47 AM   #7
Give_Em_The_DD
Banned
260
Rep
1,084
Posts

Drives: 2010 black 335xi coupe
Join Date: Sep 2013
Location: IL

iTrader: (2)

Quote:
Originally Posted by Stucks
Put a 50 or 100 cell high flow cat in it. It wont restrict flow all that much, and it will kill some of the sound.

http://mandrelbendingsolutions.com/m...ace-converter/
This

Funny I've been rebuilding my car, and got hooked up with a Cobb exhaust (thanks Jake@motiv) and i purchased a hi Flo cat just in case

I still miss my Bmw PE setup
Appreciate 0
      12-07-2015, 06:28 PM   #8
Team503
Nerd
Ireland
130
Rep
437
Posts

Drives: 2009 335i Sport/Auto/Luxury
Join Date: Jul 2013
Location: Dublin

iTrader: (5)

Quote:
Originally Posted by Give_Em_The_DD View Post
This

Funny I've been rebuilding my car, and got hooked up with a Cobb exhaust (thanks Jake@motiv) and i purchased a hi Flo cat just in case

I still miss my Bmw PE setup
Love the sounds when I'm romping, but there's some pretty heavy drone when I'm putzing around town at 2k RPM. I can live with it, but it kinda sucks on road trips, and I do lots of 150-200 mile trips.
__________________
2009 E92 335i Sport 6AT - Finished, sold
Transport for Ireland - LEAP Pass with TFI smartapp because cars are stupid expensive in Ireland
Appreciate 0
      12-07-2015, 06:30 PM   #9
Team503
Nerd
Ireland
130
Rep
437
Posts

Drives: 2009 335i Sport/Auto/Luxury
Join Date: Jul 2013
Location: Dublin

iTrader: (5)

Quote:
Originally Posted by Stucks View Post
Put a 50 or 100 cell high flow cat in it. It wont restrict flow all that much, and it will kill some of the sound.

http://mandrelbendingsolutions.com/m...ace-converter/
I'll do that. Sounds like an inexpensive solution and I don't mind getting rid of the smell somewhat. My downpipes have cats, but replacing the lack of main cat probably isn't a bad idea.
__________________
2009 E92 335i Sport 6AT - Finished, sold
Transport for Ireland - LEAP Pass with TFI smartapp because cars are stupid expensive in Ireland
Appreciate 0
Reply

Bookmarks


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 08:16 PM.




e90post
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