E90Post
 


European Auto Source
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Removing Secondary Cats



Reply
 
Thread Tools Search this Thread
      02-14-2008, 01:26 PM   #1
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,314
iTrader: (11)

Removing Secondary Cats

If I were to remove the secondary cats, what effect on sound should I expect to get? Will it be louder? Will there be drone? Will the sound have a "sharper' edge? Sorry to sound like an idiot, but Ive never removed those parts before.
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
      02-14-2008, 02:04 PM   #2
jjhan85
J-Han
 
Drives: BMW E90 325i jetblack
Join Date: Mar 2006
Location: Maryland

Posts: 398
iTrader: (0)

Garage List
yes it will sound louder...but i dunno if its a good thing... =\

not too sure
__________________
325i // Sport Package // 6 speed manual // AFE intake // Resonator + Muffler Delete // 20% tints//

jjhan85 is offline  
0
Reply With Quote
      02-14-2008, 02:24 PM   #3
Gen_E92
Brigadier General
 
Drives: slow
Join Date: Oct 2006
Location: Vancouver

Posts: 3,386
iTrader: (17)

Garage List
2007 335i  [3.90]
i recall ur current set up already has some drone, so I wouldn't recommend doing that.
Gen_E92 is offline   Japan
0
Reply With Quote
      02-14-2008, 02:32 PM   #4
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,314
iTrader: (11)

Hmmm, I see. Whats happened is that over the last 500 miles or so, the exhaust is getting quieter Sometimes I cant even hear it anymore except under hard acceleration. The drone is still there, maybe not as pronounced as before, but the nice sounds are getting quieter as well.
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
      02-14-2008, 06:10 PM   #5
arabbmw
Lieutenant
 
Drives: 335i coupe
Join Date: Nov 2007
Location: G hills

Posts: 551
iTrader: (2)

what kind of piping do you have now?

I was told by a guy who is really good with exhausts that removing the secondary cats and putting in x pipes is the way to go. Also seen it backed up here on the forums.
arabbmw is offline  
0
Reply With Quote
      02-14-2008, 06:13 PM   #6
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,314
iTrader: (11)

Piping is stock now...
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
      02-14-2008, 09:17 PM   #7
cn555ic
BimmerPost Supporting Vendor

 
cn555ic's Avatar
 
Drives: Bimmerscoding.com
Join Date: Jun 2007
Location: New York

Posts: 18,278
iTrader: (5)

Send a message via Yahoo to cn555ic
Thats the first I have heard a exhaust getting quieter as it gets broken in!! Maybe you are just getting used to it...I also feel that my CP-E exhaust is getting quieter also...I think its me being adapted and used to the noise now after 2 weeks since the install...
cn555ic is offline   United_States
0
Reply With Quote
      02-19-2008, 02:31 AM   #8
Panoz
Lieutenant Colonel
 
Panoz's Avatar
 
Drives: E92 Space Grey 335i ,Aero Kit
Join Date: Nov 2006
Location: EU

Posts: 1,576
iTrader: (0)

The change of sound is not really that big. There is a "metalic" baritone sound at 2000-3000 (as westwest888 mentioned).

There are some annoying sounds at cold start ,but when you reach the appropriate temperatures its fine.

In general , i would propose you not to delete the secondary ones but replacing them with HFC instead (100s maybe?).
__________________

Procede V4 , Catless DPs, Forge FMIC, Injen Intake, VK Oilcooler, Hartge Quads Exhaust, Modded CDV, Synapse BOV Kit, BMW Performance 335i SSK Kit, P3 vent boost gauge

Space Grey 335i -> See more pics HERE
Panoz is offline  
0
Reply With Quote
      02-19-2008, 10:52 AM   #9
Fraggy
Brigadier General
 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego

Posts: 3,314
iTrader: (11)

Thanks guys, I will leave them in. Ive already replaced the Corsa with the fake Eisenmann for now.
__________________
Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--
Fraggy is offline   United_States
0
Reply With Quote
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 04:53 AM.




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