F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Changed mufflers, good or bad?
ARMA SPEED
Post Reply
 
Thread Tools Search this Thread
      12-31-2013, 12:28 PM   #1
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Changed mufflers, good or bad?

ive had my car since feb 2013 and im just trying to figure out if what i did was a good idea. f30 335 - i put flowmaster mufflers on it, i didnt wanna spend for a full system. it sounds good, turbos are louder so i guess theyre breathing better? i recently got downpipe and jb4 stage 2 and the car is a monster. huge difference. im pretty sure i have the fastest f30 around my area, lol. let me know what you think
Appreciate 0
      12-31-2013, 12:50 PM   #2
RoundelM3
Major General
RoundelM3's Avatar
United_States
1824
Rep
6,979
Posts

Drives: 15 F80 M3, 22 G01 X3 30i
Join Date: Apr 2010
Location: Wendell, NC

iTrader: (2)

Garage List
2022 BMW X3  [9.83]
2015 BMW M3  [6.50]
"Turbos are louder"? Last time I checked, my 2013 335i had one turbo and it makes no exhaust noise; without modifying the intake, there'd be no increased intake noise either. Also, how did you get two mufflers on a single-muffler exhaust system? I'd venture you didn't install any of these things (except maybe the JB4) yourself. Your next visit to the dealer for service should be quite interesting.
__________________

2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
Appreciate 0
      12-31-2013, 02:27 PM   #3
inChargeOfIT
First Lieutenant
United_States
17
Rep
344
Posts

Drives: 2013 335i Sport
Join Date: Dec 2012
Location: Austin, TX

iTrader: (0)

Without any quantitative before/after measurements (data logging from the jb4 and dyno runs would have been great) it would be hard to say.

The only real technical concern I would have is that there may be too much (or too little?) back pressure. But if the car seems to run right and does not throw any codes (other than if you unplugged the exhaust flap module) you will probably be ok.
Appreciate 0
      12-31-2013, 04:53 PM   #4
mikew2069
Lieutenant Colonel
mikew2069's Avatar
413
Rep
1,975
Posts

Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (2)

Quote:
Originally Posted by Msport335F30 View Post
ive had my car since feb 2013 and im just trying to figure out if what i did was a good idea. f30 335 - i put flowmaster mufflers on it, i didnt wanna spend for a full system. it sounds good, turbos are louder so i guess theyre breathing better? i recently got downpipe and jb4 stage 2 and the car is a monster. huge difference. im pretty sure i have the fastest f30 around my area, lol. let me know what you think
This is actually interesting b/c I saw your video on youtube a couple months ago. This is obviously with the stock dp. Post a video with the dp. I bet its loud as shit.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
Appreciate 0
      12-31-2013, 04:55 PM   #5
mikew2069
Lieutenant Colonel
mikew2069's Avatar
413
Rep
1,975
Posts

Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (2)

Quote:
Originally Posted by roundel335 View Post
"Turbos are louder"? Last time I checked, my 2013 335i had one turbo and it makes no exhaust noise; without modifying the intake, there'd be no increased intake noise either. Also, how did you get two mufflers on a single-muffler exhaust system? I'd venture you didn't install any of these things (except maybe the JB4) yourself. Your next visit to the dealer for service should be quite interesting.
Turbos are louder as in you can hear the whistle/whine more. The mufflers are easily accomplished at any competent muffler shop and there won't be issues at the dealer as long as you set the JB4 to map 0.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
Appreciate 0
      01-01-2014, 12:43 PM   #6
RoundelM3
Major General
RoundelM3's Avatar
United_States
1824
Rep
6,979
Posts

Drives: 15 F80 M3, 22 G01 X3 30i
Join Date: Apr 2010
Location: Wendell, NC

iTrader: (2)

Garage List
2022 BMW X3  [9.83]
2015 BMW M3  [6.50]
Quote:
Originally Posted by mikew2069 View Post
Turbos are louder as in you can hear the whistle/whine more. The mufflers are easily accomplished at any competent muffler shop and there won't be issues at the dealer as long as you set the JB4 to map 0.
How exactly does a new muffler make the turbo louder (N55 only has one)? I have the MPE and I don't hear it at all. The F30 has ONE muffler, and you're dreaming if you think the dealer won't notice or care about the mods, especially the jb4. Speaking from experience here...
Appreciate 0
      01-01-2014, 01:27 PM   #7
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Quote:
Originally Posted by roundel335 View Post
"Turbos are louder"? Last time I checked, my 2013 335i had one turbo and it makes no exhaust noise; without modifying the intake, there'd be no increased intake noise either. Also, how did you get two mufflers on a single-muffler exhaust system? I'd venture you didn't install any of these things (except maybe the JB4) yourself. Your next visit to the dealer for service should be quite interesting.
I have a mod friendly dealership, yes there is one turbo. My turbos whistle loud as shit now, i had the pipes split and 2 mufflers were put in turbo now spools at 1,100 rpm
Appreciate 0
      01-01-2014, 01:27 PM   #8
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Quote:
Originally Posted by mikew2069 View Post
This is actually interesting b/c I saw your video on youtube a couple months ago. This is obviously with the stock dp. Post a video with the dp. I bet its loud as shit.
Haven't had time to record the new dp, I will soon
Appreciate 0
      01-01-2014, 01:38 PM   #9
Davinaii
Enlisted Member
0
Rep
31
Posts

Drives: 2014 BMW 335i
Join Date: Jun 2013
Location: Burlington, VT

iTrader: (0)

Quote:
Originally Posted by Msport335F30 View Post
ive had my car since feb 2013 and im just trying to figure out if what i did was a good idea. f30 335 - i put flowmaster mufflers on it, i didnt wanna spend for a full system. it sounds good, turbos are louder so i guess theyre breathing better? i recently got downpipe and jb4 stage 2 and the car is a monster. huge difference. im pretty sure i have the fastest f30 around my area, lol. let me know what you think
I'm thinking to get a DP on my car too. Would it void the warranty and pass the emission test?
Appreciate 0
      01-01-2014, 01:44 PM   #10
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Quote:
Originally Posted by Davinaii View Post
I'm thinking to get a DP on my car too. Would it void the warranty and pass the emission test?
Yeah it voids warranty and it would not pass the emission test unless you get high flow downpipe with cats. I have the catless one, I took my car to the dealer and they said nothing about the mufflers, so I'm guessing they won't care about the DP unless your dealership is strict
Appreciate 0
      01-02-2014, 08:43 AM   #11
mikew2069
Lieutenant Colonel
mikew2069's Avatar
413
Rep
1,975
Posts

Drives: F30 335i MSport
Join Date: Oct 2012
Location: Houston

iTrader: (2)

Quote:
Originally Posted by roundel335 View Post
How exactly does a new muffler make the turbo louder (N55 only has one)? I have the MPE and I don't hear it at all. The F30 has ONE muffler, and you're dreaming if you think the dealer won't notice or care about the mods, especially the jb4. Speaking from experience here...
The stock muffler muffles/quiets the volume of the turbo. When you add an aftermarket downpipe and/or mufflers, there is less sound restricting material and you can hear the turbo much easier. The MPE probably is probably the least aggressive non-stock muffler out there so the increased turbo sound will be the least with that.

If the dealer looks under his car, sure they will notice the two mufflers but no they won't care. And as long as he sets the JB4 to map0 for routine maintenance, he'll be totally fine. Now if he has a major repair to go in for, he'll probably need to take the jb4 out to be safe.
__________________
2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
Appreciate 0
      01-02-2014, 08:57 AM   #12
EB_F30
First Lieutenant
20
Rep
307
Posts

Drives: 13' M Sport 335 6MT
Join Date: Nov 2012
Location: Italy

iTrader: (0)

Curious to hear this with a DP as well.
Appreciate 0
      01-02-2014, 04:47 PM   #13
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Quote:
Originally Posted by EB_F30 View Post
Curious to hear this with a DP as well.
posting a video on youtube and posting here, should be up soon
Appreciate 0
      01-02-2014, 04:48 PM   #14
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

Quote:
Originally Posted by mikew2069 View Post
This is actually interesting b/c I saw your video on youtube a couple months ago. This is obviously with the stock dp. Post a video with the dp. I bet its loud as shit.
posting a video on youtube and posting here, should be up soon
Appreciate 0
      01-02-2014, 04:53 PM   #15
DanielBimmer
Lieutenant
DanielBimmer's Avatar
106
Rep
463
Posts

Drives: YMB M4
Join Date: Apr 2013
Location: North Hollywood,CA

iTrader: (1)

heres the video of it with the dp, didnt want to rev so high because of the cold start but you can still hear a big difference in turbo whistle/whine
Appreciate 0
Post Reply

Bookmarks

Tags
downpipe, exhaust, f30, fast, jb4

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 10:54 AM.




f30post
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