E90Post
 


TNT Racewerks
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Removing cat and res???



Reply
 
Thread Tools Search this Thread
      01-29-2013, 01:23 PM   #1
SuckMy_Nick
Red Liner
SuckMy_Nick's Avatar
United_States
10
Rep
129
Posts

Drives: E92 335i XDrive
Join Date: Dec 2012
Location: Boston

iTrader: (0)

Removing cat and res???

So I went to a custom exhaust shop in MA, I asked for better sound and flow, he suggested to delete my second cat and my res... Is this the best options? I've seen alot of people do different combinations of deletes and have heard alot of opinions.. Any one with helpful opinions and not just bias
__________________
07' E92 328xi (First BMW)
09' E92 335xi (Current Car)
Appreciate 0
      01-29-2013, 04:01 PM   #2
mike-y
just another bmw douche bag
United_States
195
Rep
3,640
Posts

Drives: 1.9L of fury
Join Date: Nov 2008
Location: Los Angeles, CA

iTrader: (4)

if you do that, it will be LOUD, so make sure that's what you want.
Appreciate 0
      01-29-2013, 04:33 PM   #3
kamek
Brigadier General
United_States
357
Rep
3,447
Posts

Drives: 2018 X3 M40i
Join Date: Mar 2008
Location: Queens, NY

iTrader: (4)

Garage List
2008 BMW 328xi  [8.20]
Quote:
Originally Posted by mike-y View Post
if you do that, it will be LOUD, so make sure that's what you want.
No, it won't be that loud, especially into a stock exhaust.
Appreciate 0
      02-01-2013, 05:49 PM   #4
apptwins
New Member
apptwins's Avatar
United_States
0
Rep
16
Posts

Drives: e90 2006 325xi 6MT
Join Date: Jan 2012
Location: Golden, Colorado

iTrader: (0)

Highly recommend performing a secondary-cat-ectomy. We cut those out at my local shop and tossed them in the dust bin. Worthless little pieces of crap!

Now whatever other exhaust mods you do will be a true enhancement.

Cheers mate
__________________

Cheers-Bill
2006 E90 (early build 11/05) 325xi 6MT Alpine White, DeBadged, Rogue-ICON, stainless brakelines, Power Slot rotors, CDV delete, post-CAT delete, aFe intake+MAF TimShim, LED interior lighting, Escort Passport 8500 x50
Appreciate 0
      02-01-2013, 06:22 PM   #5
RaddM4
Second Lieutenant
United_States
15
Rep
278
Posts

Drives: 2015 F82 & 991 GT3
Join Date: Mar 2012
Location: San Diego

iTrader: (2)

I have the perfect recommendation for you. Check it out!

Appreciate 0
      02-01-2013, 08:52 PM   #6
apptwins
New Member
apptwins's Avatar
United_States
0
Rep
16
Posts

Drives: e90 2006 325xi 6MT
Join Date: Jan 2012
Location: Golden, Colorado

iTrader: (0)

Like !!
Whooo Whoooo !!!
__________________

Cheers-Bill
2006 E90 (early build 11/05) 325xi 6MT Alpine White, DeBadged, Rogue-ICON, stainless brakelines, Power Slot rotors, CDV delete, post-CAT delete, aFe intake+MAF TimShim, LED interior lighting, Escort Passport 8500 x50
Appreciate 0
      02-01-2013, 09:43 PM   #7
SuckMy_Nick
Red Liner
SuckMy_Nick's Avatar
United_States
10
Rep
129
Posts

Drives: E92 335i XDrive
Join Date: Dec 2012
Location: Boston

iTrader: (0)

Quote:
Originally Posted by RaddN54
I have the perfect recommendation for you. Check it out!

Still got my whistle installed, I wanna make it louder
__________________
07' E92 328xi (First BMW)
09' E92 335xi (Current Car)
Appreciate 0
      02-02-2013, 12:21 AM   #8
SDemetris
FSAE Dude
United_States
61
Rep
759
Posts

Drives: E90 328xi
Join Date: Jul 2012
Location: Pittsburgh, PA

iTrader: (0)

Not that loud. I have PE which is res-less and cat delete and i would say its a good volume
__________________
2007 TiAg 328xi: AA Tune, AFE intake, Full exhaust, 335xi Brakes, H&R RSB, UUC FSB, H&R Sports, Billy Sports...BBS SR 17x8

1985 Gazelle Beige 325e: Poly everything, e24 3.25 LSD, 225 lb weight reduction, Corbeau FX1, Shifter machined by me, roll bar, harness, all the other goodies. My "Racecar"...15x7 BBS RA
Appreciate 0
      02-02-2013, 02:20 AM   #9
Amini77
Brigadier General
United_States
185
Rep
4,732
Posts

Drives: Alpine White '13 550i
Join Date: Nov 2011
Location: Tarzana, CA

iTrader: (1)

Garage List
2013 BMW 550i  [0.00]
Quote:
Originally Posted by SDemetris View Post
Not that loud. I have PE which is res-less and cat delete and i would say its a good volume
Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?
Appreciate 0
      02-02-2013, 02:07 PM   #10
SDemetris
FSAE Dude
United_States
61
Rep
759
Posts

Drives: E90 328xi
Join Date: Jul 2012
Location: Pittsburgh, PA

iTrader: (0)

Quote:
Originally Posted by Amini77 View Post
Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?
Secondaries.
__________________
2007 TiAg 328xi: AA Tune, AFE intake, Full exhaust, 335xi Brakes, H&R RSB, UUC FSB, H&R Sports, Billy Sports...BBS SR 17x8

1985 Gazelle Beige 325e: Poly everything, e24 3.25 LSD, 225 lb weight reduction, Corbeau FX1, Shifter machined by me, roll bar, harness, all the other goodies. My "Racecar"...15x7 BBS RA
Appreciate 0
      02-02-2013, 02:21 PM   #11
Amini77
Brigadier General
United_States
185
Rep
4,732
Posts

Drives: Alpine White '13 550i
Join Date: Nov 2011
Location: Tarzana, CA

iTrader: (1)

Garage List
2013 BMW 550i  [0.00]
Quote:
Originally Posted by SDemetris View Post
Secondaries.
That only answered 1/3 of my questions lmao
Appreciate 0
      02-02-2013, 04:20 PM   #12
SDemetris
FSAE Dude
United_States
61
Rep
759
Posts

Drives: E90 328xi
Join Date: Jul 2012
Location: Pittsburgh, PA

iTrader: (0)

Quote:
Originally Posted by Amini77 View Post
That only answered 1/3 of my questions lmao
Sorry i was on my phone.. i only got my secondaries off because it was cheaper and i didnt have to buy any O2 sims.. but your understanding is correct
__________________
2007 TiAg 328xi: AA Tune, AFE intake, Full exhaust, 335xi Brakes, H&R RSB, UUC FSB, H&R Sports, Billy Sports...BBS SR 17x8

1985 Gazelle Beige 325e: Poly everything, e24 3.25 LSD, 225 lb weight reduction, Corbeau FX1, Shifter machined by me, roll bar, harness, all the other goodies. My "Racecar"...15x7 BBS RA
Appreciate 0
      02-02-2013, 04:33 PM   #13
DUI Elite
///M at Heart
DUI Elite's Avatar
89
Rep
1,954
Posts

Drives: 06 SGM E90, 15 BSM E84
Join Date: Jan 2011
Location: Chicago, IL

iTrader: (4)

still debating if this is worth it.

I've been tossing around the idea for months. I've noticed my exhaust is getting louder (as the exhaust ages). My parents even ask, when I rarely have them in the car, if I did something to it as they don't remember it being as loud when I had it new.

I kinda want to trust them in thinking its gotten louder because they've only been in it a few times over a pretty good amount of time since I've had it and they're picking up on a difference.
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



All times are GMT -5. The time now is 07:39 AM.




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