Center muffler for flow on stock exhaust? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
Go Back   Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum > Technical / Performance / Model > Mazda 6 1st Generation (2002-2008) > Mazdaspeed6 > Speed6 Engine/Drivetrain
New User? Register
Mazda6Club.com is the premier Mazda 6 Forum on the internet. Registered Users do not see the above ads.
User Tag List

Reply
 
LinkBack Thread Tools
Old 11-20-2012, 06:07 AM   #1 (permalink)
Registered User
 
mmarfan's Avatar
 
Join Date: May 2003
Location: Lebanon, Oh
Posts: 2,151
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 1 reviews
Send a message via AIM to mmarfan
Default Center muffler for flow on stock exhaust?

So I moved into a nice neighborhood and for the benefit of my neighbors not getting mad at 5:00am I decided to remove my Corksport exhaust and put my stock exhaust back on. Even though a have a CP-E downpipe w/ cat, There is pretty much no exhaust sound anymore, so goal #1 accomplished.

Unfortunately, I noticed a substantial decrease in power doing this (~25hp). The nice flow that the Corksport 3" pipe had all the way back is now restriced BADLY by the 2 1/4"? stock exhaust.

What I want to do is put a large 3" muffler between the mounting points of the exhaust and just before it bends around the rear differential to gain most of the lost flow back, then reduce it down to the stock exhaust. I believe the sound should still be very minimal. Has anyone done this? FYI there is a cat in the stock cat location so nothing can be mounted there.
mmarfan is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-20-2012, 11:39 AM   #2 (permalink)
Registered User
 
oh_yeams6's Avatar
 
Join Date: Nov 2010
Location: Dallas
Posts: 2,423
Mentioned: 24 Post(s)
Tagged: 1 Thread(s)
Quoted: 210 Post(s)
Thanks: 344
Thanked 764 Times in 523 Posts
Groans: 6
Groaned at 5 Times in 5 Posts
iTrader: 17 reviews
Default

If you are looking to reduce sound get a resonator or two welded into the corksport. The closer they are to the engine the more they will help, this has been dicussed many times.

Get the vibrant 3" in/out http://www.google.com/url?sa=t&rct=j...1n-LtuZ8euTX4A

Also, the stock catback is not going to reduce power by 25, but maybe 5-10
__________________
Sold my MS6 10.30.13

Guide to Preventative Maintenance and Modding
DIY FMIC for $220
oh_yeams6 is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 03:05 PM   #3 (permalink)
Registered User
 
mmarfan's Avatar
 
Join Date: May 2003
Location: Lebanon, Oh
Posts: 2,151
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 1 reviews
Send a message via AIM to mmarfan
Default

I'm not buying the 5 - 10 hp loss on the stock exhaust. There is just too much difference. It may be a torque loss over hp. Is there dyno proof of that claim?

I've looked around the forum on this topic, but haven't found exactly what I want. The closest I've seen someone do is a 3" back into the stock mufflers, which is originally what I wanted to do. Unfortunately, the exhaust shop I went to could not do this.

I just want better flow with no noise.
mmarfan is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 03:38 PM   #4 (permalink)
Registered User
 
6Y MAZDA's Avatar
 
Join Date: Sep 2010
Location: Northern Virginia
Posts: 3,589
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 572 Post(s)
Thanks: 482
Thanked 1,109 Times in 786 Posts
Groans: 18
Groaned at 34 Times in 30 Posts
iTrader: 2 reviews
Default

According to the guru's at MSF, the stock exhaust is actually not very restrictive at all. According to them, if you are looking for power, upgrading the exhaust is the last place to look for it. A lot of them are actually running stock exhaust. Main reason for exhaust is sound.
__________________
1996 Miata

SOLD: 2006 BCM MS6 GT #00584
CP-E 3" Straight Pipe Exhaust. CP-E TMIC. HTP 3" TIP. Custom 3.5" MAF SRI. SU RMM. SU TP. Forge V1 BPV. Cobb AP. RichTuned. Denso ITV22. PTP HPFP Internals. STi S204 Lip. Megan Racing Springs. XXR 530 18x8.75 +33. VEI Boost Gauge with Block8head pod. Blox Shift Knob.

SOLD: 2009 Mazda 6i GT.



6Y MAZDA is online now   Reply With Quote Quick reply to this message
The Following User Says Thank You to 6Y MAZDA For This Useful Post:
oh_yeams6 (11-20-2012)
Old 11-20-2012, 03:39 PM   #5 (permalink)
Registered User
 
6Y MAZDA's Avatar
 
Join Date: Sep 2010
Location: Northern Virginia
Posts: 3,589
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 572 Post(s)
Thanks: 482
Thanked 1,109 Times in 786 Posts
Groans: 18
Groaned at 34 Times in 30 Posts
iTrader: 2 reviews
Default

My biggest concern for you is you are running a DP with no HPFP internals and no AP. ZZB is imminent.
__________________
1996 Miata

SOLD: 2006 BCM MS6 GT #00584
CP-E 3" Straight Pipe Exhaust. CP-E TMIC. HTP 3" TIP. Custom 3.5" MAF SRI. SU RMM. SU TP. Forge V1 BPV. Cobb AP. RichTuned. Denso ITV22. PTP HPFP Internals. STi S204 Lip. Megan Racing Springs. XXR 530 18x8.75 +33. VEI Boost Gauge with Block8head pod. Blox Shift Knob.

SOLD: 2009 Mazda 6i GT.



6Y MAZDA is online now   Reply With Quote Quick reply to this message
Old 11-20-2012, 03:46 PM   #6 (permalink)
Registered User
 
IHeartGroceries's Avatar
 
Join Date: Jan 2007
Location: Fort Worth, TX
Posts: 5,314
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 197 Post(s)
Thanks: 1,279
Thanked 1,233 Times in 775 Posts
Groans: 3
Groaned at 8 Times in 8 Posts
iTrader: 0 reviews
Default

I don't think CS's, or any 3"+ system can ever be made quiet.

I am having trouble visualizing your description, but do you mean adding a single muffler to the midpipe section of the car? Under the cabin?

You cant fit one there, can you? I guess you don't like the idea of a single exit exhaust?

You ever consider a cut-out? Maybe a cutout fabbed into the OE system, or something like the Magnaflow CB with a cutout?
__________________


2006 MS6 - Stock, SOLD and gone forever.
New ride - 2013 Ford Taurus SHO, 402A & Perf. Pkg.
Stage 4 Livernois Tuned
IHeartGroceries is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 06:16 PM   #7 (permalink)
Registered User
 
jm211's Avatar
 
Join Date: Oct 2011
Location: Wausau, Wi
Posts: 1,285
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 209 Post(s)
Thanks: 654
Thanked 321 Times in 273 Posts
Groans: 12
Groaned at 4 Times in 3 Posts
iTrader: 0 reviews
Default

imminent, i dont know about that. More like 5 seconds ago.

i have single out and is noisy. leaves a black eye on exhaust valance too.
__________________
Black Mica 2006 Speed6 GT | 60,000 Miles
Cobb AP | Stage 1 | JBR Stage II Intake - Blue | CP-e Exhaust | JBR RMM | SURE Shortcut | SURE Return | SURE Anchors | SURE AGS 625g Shift Knob | All Amsoil Fluids | Forge V1

I'm Registered. Are You? www.Ms6db.com


"I would happily admit to anybody that the Mazdaspeed6 should come with a warning label..."
-TiGraySpeed6
jm211 is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 06:56 PM   #8 (permalink)
Registered User
 
mmarfan's Avatar
 
Join Date: May 2003
Location: Lebanon, Oh
Posts: 2,151
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 1 reviews
Send a message via AIM to mmarfan
Default

Quote:
Originally Posted by IHeartGroceries View Post
I don't think CS's, or any 3"+ system can ever be made quiet.

I am having trouble visualizing your description, but do you mean adding a single muffler to the midpipe section of the car? Under the cabin?

You cant fit one there, can you? I guess you don't like the idea of a single exit exhaust?

You ever consider a cut-out? Maybe a cutout fabbed into the OE system, or something like the Magnaflow CB with a cutout?
Yes, adding a muffler under the car in the mid section of the exhaust, under the cabin. I just can't think of why going from the 3" to the stock 2 1/4" is ok for power? The flow area a reduced by almost 50%! I would just like a smoother transition between the sections to help with flow.

I have not measured officially yet, but I do believe there is (barely) room to mount one there.

As for the single exhaust, I don't like the "black eye" as mentioned above.
mmarfan is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 07:02 PM   #9 (permalink)
Registered User
 
mmarfan's Avatar
 
Join Date: May 2003
Location: Lebanon, Oh
Posts: 2,151
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
Groans: 0
Groaned at 2 Times in 2 Posts
iTrader: 1 reviews
Send a message via AIM to mmarfan
Default

Quote:
Originally Posted by 6Y MAZDA View Post
My biggest concern for you is you are running a DP with no HPFP internals and no AP. ZZB is imminent.
Yep, been running the DP for 40,000 miles. No problems with the HPFP. It's funny, I'm on the original pump one to that is usually junk.

What is AP and ZZB?

I did have the CP-E DP crack on me and had to get it re-welded, but so far, so good.
mmarfan is offline   Reply With Quote Quick reply to this message
Old 11-20-2012, 08:41 PM   #10 (permalink)
Registered User
 
ctmazda's Avatar
 
Join Date: Jan 2011
Posts: 1,831
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 268 Post(s)
Thanks: 584
Thanked 307 Times in 269 Posts
Groans: 1
Groaned at 4 Times in 4 Posts
iTrader: 0 reviews
Default

AP=AcessPort
ZZB=ZoomZoomBoom usually as in throwing a rod.
__________________
2004 Mazda 6 Sport V6 MTX-Steel Grey

MSDS Headers/Ported Intake Manifolds + 1/2" Spacer/Injen CAI/3.7L OTB/TGNY TB Spacer/Magnaflow CBE/AWR 88 Mounts/Rotora H2 Ceramic Brakes//CF Evo Hood,Grill,Eyelids,Window Visors,Mirror Covers/CAR-LED Tails/35W 5000k HIDs/55W 6000k Integrated Fogs/LED Fogs/1000w Xplōd Amp/Two 800w 12" Xplōd Subs/15% Tints/18x8.5 +50 Kazera "CF" Rims/Hankook Ventus Evo 245/40/18


Future Mods:Powermod Tuner/Custom DoubleDin/BC Coils
ctmazda is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 11:19 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2