Magnaflow to Dynomax - Ford Muscle Forums : Ford Muscle Cars Tech Forum
Reply
 
LinkBack Thread Tools
post #1 of 27 (permalink) Old 07-30-2011, 07:46 AM Thread Starter
Subscriber
 
Join Date: Sep 2006
Location: Vancouver, Canada
Posts: 1,704
Magnaflow to Dynomax

Everyone out there probably has an opinion on muffler sound and selection. My issue is that the Magnaflow worked well prior to my engine upgrade and now my 289 sounds more like John Force's top fuel. Would the Dynomax quite down the exhaust or am I just wasting time and money. Would resonators on my 66 mustang exhaust help. I was thinking that putting some prior to the exhaust tips.

Thanks
Greg
foleysfriend is offline  
Sponsored Links
Advertisement
 
post #2 of 27 (permalink) Old 07-30-2011, 01:46 PM
Tech Contributor Gold
 
Join Date: Dec 2004
Location: Amish Wonderland Of Central PA
Posts: 4,908
Garage
Re: Magnaflow to Dynomax

With the Dynomax turbos I can talk to a passenger in a normal voice while listening to the radio when cruising. Nice low rumble from the tailpipes at idle, but will still put out a decent sound under hard acceleration.

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]
dennis111 is offline  
post #3 of 27 (permalink) Old 07-30-2011, 04:19 PM
Registered User
 
Join Date: Apr 2004
Location: Roswell, Ga
Posts: 210
Re: Magnaflow to Dynomax

I went from Magnaflows to Dynomax turbos and it's quieter. I have (had) the 2 1/2" stainless mandrel bent Magnaflow system and couldn't stand the noise and 'boomyness'. I changed the mufflers to Dynomax turbos and it's more quiet and the noise seemed to have moved rearward so conversation is possible. Still not quite quiet enough but I can live with it for now.

I also have the tips turned down 90 degrees right before the rear valence and this may be contributing to the boomyness so my next move is to get rid of the turn downs and go straight out the back , ala GT style.

Greg Z.
\'66 GT fastback
gjz30075 is offline  
 
post #4 of 27 (permalink) Old 07-31-2011, 02:11 PM
Subscriber
 
Join Date: Mar 2007
Location: Paris (FRANCE)
Posts: 317
Garage
Re: Magnaflow to Dynomax

Dynomax superturbo are not straighthru like Magnaflow one, so you will loose HP..

Dynomax ultraflow are straighthru and they sound no quieter than magnaflow mufflers.

You should try to swap your mufflers with longer magnaflow ones, with straigthru design, longer they are, quieter they are...

teyerdhal is offline  
post #5 of 27 (permalink) Old 07-31-2011, 04:47 PM Thread Starter
Subscriber
 
Join Date: Sep 2006
Location: Vancouver, Canada
Posts: 1,704
Re: Magnaflow to Dynomax

Just in from setting the carb and ignition. Thanks for the info on the sound difference. Most of my driving will be in town cruising and not at the track. the drone at 2000 rpm just drills through the floor. I even have Dynamat and under coating. I understand there will be a loss in Hp, but may give it a try. Sound like the tone at idle is acceptable. I was quoted $90 each. May get a better price in Bellingham Wa.

Thanks
Greg
foleysfriend is offline  
post #6 of 27 (permalink) Old 07-31-2011, 04:55 PM
Tech Contributor Gold
 
Join Date: Dec 2004
Location: Amish Wonderland Of Central PA
Posts: 4,908
Garage
Re: Magnaflow to Dynomax

At the end of this video you can hear what my 393 sounds like with Dynomax turbos through tailpipes. Love the sleeper rumble . . . . .


Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. 9[email protected]
dennis111 is offline  
post #7 of 27 (permalink) Old 08-01-2011, 12:10 AM
Subscriber
 
Join Date: Mar 2007
Location: Paris (FRANCE)
Posts: 317
Garage
Re: Magnaflow to Dynomax

Magnaflow are not supposed to be droning mufflers, if so, sound absorbing material must be cooked and gone away...

How old are they?

teyerdhal is offline  
post #8 of 27 (permalink) Old 08-01-2011, 05:21 AM
Registered User
 
Join Date: Apr 2001
Location: Central West Virginia
Posts: 7,348
Re: Magnaflow to Dynomax

Dynomax Ultra-Flows and Magnaflows are pretty much identical. You can pick either up, and see straight through them. They both use a perforated core to absorb the sound. However, over time, the packing tends to work its way loose, and get blown out the tailpipe.... and they gradually get louder and louder. After a few years and a lot of miles, they can get pretty noisy.

With this type of 'absorption' muffler, the longer they are, the quieter they are. There's not sufficient room under a mustang sized car to run the extra long mufflers, but on longer cars, the longer units can be used for a quieter sound... with no sacrifice in performance.

Good Luck!
n2omike is offline  
post #9 of 27 (permalink) Old 08-01-2011, 08:42 PM Thread Starter
Subscriber
 
Join Date: Sep 2006
Location: Vancouver, Canada
Posts: 1,704
Re: Magnaflow to Dynomax

From what I can make out in the video Dennis that sound is nice and deep compared to what I have right now. There may be a chance that the Magnaflow have blown some packing out, so going to the Dynomax Super Turbo is worth a try. I had some turbo mufflers on the car years ago and they sounded great , but the manufacturer went out of business. I also need to get rid of my GT Tips they make a odd sound at idle with the louvers. May want to go with the straight tips. Thanks for all the help.

Greg
foleysfriend is offline  
post #10 of 27 (permalink) Old 08-01-2011, 08:45 PM Thread Starter
Subscriber
 
Join Date: Sep 2006
Location: Vancouver, Canada
Posts: 1,704
Re: Magnaflow to Dynomax

The mufflers are about 3-4 years old. What is the life of Magnaflow mufflers.

Greg
foleysfriend is offline  
post #11 of 27 (permalink) Old 08-08-2011, 09:59 AM
Registered User
 
Join Date: Sep 2001
Location: Anaheim Hills, Ca
Posts: 1,475
Re: Magnaflow to Dynomax

I did the opposite where I went from dynomax dual 2.5s with an H pipe to Magnaflow dual 2.5s with a custom X pipe. It is quieter with the Magnaflows which was a surprise. It must be the X pipe that has quieted it down and made it sound less like a boat.

I have to say it sounds a lot like a new car such as a Corvette or Mustang. I was told that the new hi performance cars have X pipes so maybe it explains why the car sounds like a new car. To explain what it sounds like when I open it up, it has a higher pitched sound as though the exhaust velocity thru the system is higher and the roar is higher pitched

Tracy Blackford: Anaheim Hills, Ca
www.pacificthunderperformance.com
65 Mustang, 331 custom built with 289 H beam rods and 383W piston, 282S cam, self-ported '70 351w heads, T5z, 9" w/3.89s. 430 [email protected]
blkfrd is offline  
post #12 of 27 (permalink) Old 08-08-2011, 11:51 AM
Subscriber
 
Join Date: Mar 2007
Location: Paris (FRANCE)
Posts: 317
Garage
Re: Magnaflow to Dynomax

Quote:
Originally Posted by n2omike View Post
There's not sufficient room under a mustang sized car to run the extra long mufflers, but on longer cars, the longer units can be used for a quieter sound... with no sacrifice in performance.

Good Luck!
I use 24" round magnaflow under my mustang, if you put them closer from the driveshaft, there is enough room..

teyerdhal is offline  
post #13 of 27 (permalink) Old 08-08-2011, 07:44 PM
Registered User
 
Join Date: Jan 2011
Location: Springfield Missouri
Posts: 734
Re: Magnaflow to Dynomax

FLOW MASTERS ALL THE WAY!!!
craigerGTA is offline  
post #14 of 27 (permalink) Old 08-08-2011, 09:21 PM
Registered User
 
Join Date: Apr 2001
Location: Central West Virginia
Posts: 7,348
Re: Magnaflow to Dynomax

Quote:
Originally Posted by teyerdhal View Post
I use 24" round magnaflow under my mustang, if you put them closer from the driveshaft, there is enough room..
There's just not enough room to do a proper tailpipe without running the muffler outlet pretty much right into the axle tube... which requires a pretty serious 90 bend right out of the muffler, and if you're using a muffler shop bender instead of store-bought mandrel bends, you'll end up with some seriously crushed/kinked pipe.

Flowmasters... or Flowdisasters. They do NOT run with the mufflers you can see straight through, like the Magnaflows and Dynomax Ultra Flows.

Good Luck!
n2omike is offline  
post #15 of 27 (permalink) Old 08-08-2011, 11:01 PM
Subscriber
 
Join Date: Mar 2007
Location: Paris (FRANCE)
Posts: 317
Garage
Re: Magnaflow to Dynomax

Quote:
Originally Posted by n2omike View Post
There's just not enough room to do a proper tailpipe without running the muffler outlet pretty much right into the axle tube... which requires a pretty serious 90 bend right out of the muffler, and if you're using a muffler shop bender instead of store-bought mandrel bends, you'll end up with some seriously crushed/kinked pipe.


Good Luck!
Absolutly not, almost straight..
Attached Thumbnails
Click image for larger version

Name:	Echappement 6.jpg
Views:	1848
Size:	116.8 KB
ID:	18907   Click image for larger version

Name:	Echappement 7.jpg
Views:	939
Size:	104.2 KB
ID:	18908  


Last edited by teyerdhal; 08-08-2011 at 11:04 PM.
teyerdhal is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Muscle Forums : Ford Muscle Cars Tech 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:
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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Welcome Magnaflow! administrator MagnaFlow 6 11-17-2010 05:38 PM
Dynomax VT Mufflers wsa111 All Ford Techboard 0 06-13-2010 02:53 PM
Dynomax UltraFlo Welded vs Dynomax Super Turbos iryshman Mustang Pages (1965-1973) 3 02-26-2007 08:17 PM
Dynomax on Thunderbird fzrdan Late Model EFI Techboard 2 06-09-2003 11:46 PM
Dynomax or Flowmaster fzrdan All Ford Techboard 1 08-16-2002 11:09 PM

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome