E90Post
 


Bimmer Retrofit
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > e90 328I Cat removal?



Reply
 
Thread Tools Search this Thread
      07-09-2009, 06:51 PM   #1
Metal*07*328i*Head
Banned
United_States
6
Rep
390
Posts

 
Drives: SG, Step, 18" 123's, BMS, ect.
Join Date: Sep 2007
Location: Simi Valley, CA

iTrader: (0)

e90 328I Cat removal?

Hey guys, What are the pros and cons to this? Any HP or TQ gains? Loss?

Any info would be great, thanks!
Appreciate 0
      07-10-2009, 12:17 PM   #2
Metal*07*328i*Head
Banned
United_States
6
Rep
390
Posts

 
Drives: SG, Step, 18" 123's, BMS, ect.
Join Date: Sep 2007
Location: Simi Valley, CA

iTrader: (0)

Hey Thanks David, I like the new wheels btw.

Did you keep the resonator? will it smog or will I get beat up by the dealer and EPA?
Appreciate 0
      07-14-2009, 06:59 PM   #3
Skywagon
Private First Class
Skywagon's Avatar
2
Rep
176
Posts

 
Drives: X6 3.5
Join Date: Jun 2009
Location: The Old South

iTrader: (0)

Removed the two front cats on my 09 328i and gained 14 hp. Have the dyno print outs to prove it too. Been working on getting rid of "service engine soon light but no luck yet. Car needs headers.
Appreciate 0
      07-14-2009, 07:54 PM   #4
mbj898
Second Lieutenant
mbj898's Avatar
United_States
3
Rep
297
Posts

 
Drives: 2006 325xi
Join Date: Jun 2008
Location: Rochester, NY

iTrader: (1)

Send a message via AIM to mbj898
Quote:
Originally Posted by Skywagon View Post
Removed the two front cats on my 09 328i and gained 14 hp. Have the dyno print outs to prove it too. Been working on getting rid of "service engine soon light but no luck yet. Car needs headers.
14 sounds like a lot for just a cat delete but i guess if you have the dyno to prove it, maybe its just an anomaly. i would say more like 3-5 per cat

if you have a CEL in most states it will not pass emissions, and will also carry a hefty fine if your caught for that mod
Appreciate 0
      07-14-2009, 10:18 PM   #5
mbj898
Second Lieutenant
mbj898's Avatar
United_States
3
Rep
297
Posts

 
Drives: 2006 325xi
Join Date: Jun 2008
Location: Rochester, NY

iTrader: (1)

Send a message via AIM to mbj898
Quote:
Originally Posted by Skywagon View Post
Removed the two front cats on my 09 328i and gained 14 hp. Have the dyno print outs to prove it too. Been working on getting rid of "service engine soon light but no luck yet. Car needs headers.
how did you do this cat delete, did you just gut them or did you weld in a test pipe?
__________________
-2006 325xi - DD - 75 shot nitrous

Appreciate 0
      07-14-2009, 11:54 PM   #6
TommyK
Brigadier General
TommyK's Avatar
United_States
51
Rep
3,326
Posts

 
Drives: E90 335i LCI
Join Date: Aug 2008
Location: Orange County, CA

iTrader: (9)

Garage List
2009 BMW 335i LCI  [0.00]
2006 E90 330i  [0.00]
Send a message via AIM to TommyK
ive seen the smog that comes out of the pipe with a res delete on a 325 and its so noticable compared to stock, i didn think the secondary cats would do much but they do. in cali i would stay away from this mod honestly. its all preferance, but your HP gains arnt worth the risk, just use the money to get an intake or exhaust, that will sound just as good and will be legal. once you do that and you still dont like how it sounds and you have money to spend changing things arround with the cats then by all means just do it and buy a O2 sim. and change it out everytime you have to get a smog check
Appreciate 0
      07-27-2009, 05:18 AM   #7
ken714
Banned
1
Rep
114
Posts

 
Drives: 09 lci AW
Join Date: Feb 2009
Location: Huntington Beach CA

iTrader: (0)

Quote:
Originally Posted by Skywagon View Post
Removed the two front cats on my 09 328i and gained 14 hp. Have the dyno print outs to prove it too. Been working on getting rid of "service engine soon light but no luck yet. Car needs headers.
can we see the sheet please
Appreciate 0
      07-29-2009, 03:31 PM   #8
Metal*07*328i*Head
Banned
United_States
6
Rep
390
Posts

 
Drives: SG, Step, 18" 123's, BMS, ect.
Join Date: Sep 2007
Location: Simi Valley, CA

iTrader: (0)

Id love to see your dyno sheet also, And Im in Cali along with David, and he has his done... Im tempted to have my shop weld me a custom set of headers.. with a removable Cat section maybe??

Plug and play app basically.. Might be a pipe dream but I will see what can be done.

Any interest if it can be?
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 01:02 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