Reducing resonance from Magnaflows...

usa1

Member

Feb 14, 2003

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16

Dec 29, 2004

#1

• Dec 29, 2004

• #1

I have a 2003 GT and I installed Magnaflows a while ago. Overall the sounds is great, but the resonance I get when driving on the freeway at a constant 2,000 RPM is annoying. Other than driving around in 4th gear, raising/lowering my speed, or installing 3.73 gears, what can I do to reduce the resonance I get? Thanks!

Mark

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Dec 29, 2004

#2

• Dec 29, 2004

• #2

Are they magnapacks or the regular SS mufflers? What midpipe are you using? Thats probably what you will have to change.

 

usa1

Member

Feb 14, 2003

125

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16

Dec 29, 2004

#3

• Dec 29, 2004

• #3

They are Magnaflow, not Magnapacks. It's the full cat back system. Aside from the Magnaflow cat back, the rest of the exhaust system is stock.

Mark

 

hotmustang331

Active Member

Apr 29, 2004

2,967

3

48

Bastrop,TX

Dec 29, 2004

#4

• Dec 29, 2004

• #4

Ok well aside from those fixs you mentioned, the only way I see of maybe making it go away is by going with an aftermarket midpipe.I will be getting my magnaflow SS catback pretty soon so I will let you know if I have a drone with my Xpipe...but I have always heard that the SS catback dosnt have a drone.Now my stock catback has a kind of loud different tone at 1900-2000RPM, if thats what your talking about (not the low frequency tone that seems to rattle things and give a weird feeling of pressure on your body and ears..drone) then I guess gears are your best bet...3.55s should up you out of that range and would still be a very good highway gear.Or you could always slow down to the speed limit LOL.2000RPMs is like what 75MPH right.

 

J

just some guy

Founding Member

Sep 23, 2002

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FL

Dec 29, 2004

#5

• Dec 29, 2004

• #5

i have 0 drone, mac lts, x, magnaflow catback

 

crew_dawg16

New Member

Apr 25, 2004

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DeKalb, IL

Dec 29, 2004

#6

• Dec 29, 2004

• #6

4.10's will solve your problem. Magnaflows are one of the more quiet mufflers on the market, so maybe you just have a low tolerance. An aftermarket X will just make it louder.

 

B

BMurphy

New Member

Nov 2, 2004

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New Hampshire

Dec 29, 2004

#7

• Dec 29, 2004

• #7

I notice more wind noise than drone with my MagnaFlows. You might want to try putting some sound deadning material in the trunk like Dynamat Extreme or B Quiet Brownbread or something like that. I plan on doing mine in the spring along with come V Comp under the rugs.

 

F

ForPointSex

Founding Member

Mar 19, 2002

395

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Mercer, NJ

Dec 29, 2004

#8

• Dec 29, 2004

• #8

I had the same problem. I bought some bassani baffles and I can live with it now. It's 1/2 the drone. (Part number 4699-5, $35.00 each.) You can remove them on weekends or the track in a minute.

Here's a pic: http://www.geocities.com/joop1987/exhaust.jpg

 

nickthegenius

Active Member

Dec 23, 2002

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Elwood, IN

Dec 29, 2004

#9

• Dec 29, 2004

• #9

I second low tolerance. My GT had the stock midpipe and Magnaflow catback after exhaust change #3 in the summer of '03. It was by far the quietest V8 I've ever owned aside from the stock catback which lasted all of 800 miles. Even my 2 Formulas were louder stock at steady cruising speeds than my GT with Magnaflows.

Then I changed to a UPR X-pipe (Exhaust Version 4.0) and it was still quiet. It was only until I got 3.73s that it made noise at steady cruising speeds.

 

Yellow01GT

Founding Member

Dec 14, 2001

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Jefferson City, MO

Dec 29, 2004

#10

• Dec 29, 2004

• #10

Wow, you probably wouldn't be able to stand the Magnapacks for 2 seconds. Magnaflows are pretty tame compared to the packs.

But, to answer your question, I would suggest a catted x pipe or those Bassani baffles...the x pipe made the drone with my exhaust quiet down a little bit.

 

F

ForPointSex

Founding Member

Mar 19, 2002

395

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Mercer, NJ

Dec 29, 2004

#11

• Dec 29, 2004

• #11

Here is my car with and without the baffles.
No Baffles

Baffle


My exhaust consists of Magnaflow catback and Magnaflow catted X.

 

usa1

Member

Feb 14, 2003

125

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16

Dec 30, 2004

#12

• Dec 30, 2004

• #12

Thanks for the advice guys. I'm thinking the gears is the way to go.

Mark

 

COBRA90GT

Mustang Master

Sep 22, 2001

6,654

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87

HOCKEYTOWN ® , MI

Dec 30, 2004

#13

• Dec 30, 2004

• #13

usa1 said:

Thanks for the advice guys. I'm thinking the gears is the way to go.

Mark

Click to expand...

Yup, either new gears will work or drive slightly faster/slower (RPMs) to get out of that "resonance zone."

 

R

Rio96

New Member

Sep 11, 2003

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Dec 30, 2004

#14

• Dec 30, 2004

• #14

How is the muff n pipes, suspended from the bottom of
the car?
.
Rubber straps
coathanger wires
metal hooks
.
perhaps trying rubber blocks/straps
would get rid of the noise.

 

usa1

Member

Feb 14, 2003

125

0

16

Dec 31, 2004

#15

• Dec 31, 2004

• #15

Rio96 said:

How is the muff n pipes, suspended from the bottom of
the car?
.
Rubber straps
coathanger wires
metal hooks
.
perhaps trying rubber blocks/straps
would get rid of the noise.

Click to expand...

I'm using the stock rubber hangers and bushings on the Magnaflow system. The Magnaflow systems lines right up with the stock mounting locations.

Mark

 

W

wanta04GT

Founding Member

Jun 15, 2002

77

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MA

Jan 1, 2005

#16

• Jan 1, 2005

• #16

I did exactly what ForPointSex did and while it did not make it go away totally, it helped out enormously. I forget the actual size but just meaure the exhaust tip. Actually in the warm weather, I remove them since I drive with my window open and resonance is not an issue.

I remember my first drive after installing the Magnaflows and wondering if I just made a huge mistake. I wanted it louder than stock but they were not 'barely' louder than stock in my opinion as everyone had suggested. To each is own but I drive 100+ miles a day and the baffles made all the difference.

I did not use the hole that is in the exhaust tip, I pushed them in until they hit the actual pipe and then drilled new holes for the screws that holds them in. They are not so noticeable that way. I also painted them with flat black engine paint to help them blend in.