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Re: Need a Quieter Muffler - Please Help [Re: YO7_A66] #1614652
05/02/14 10:50 AM
05/02/14 10:50 AM
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Posts: 1,526
North Carolina
cjskotni Offline OP
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Quote:

This is how member DAVENC mounted his second muffler in the above reference.
If is a Magnaflow 7x14 piece. I will be using this idea when I change my exhaust system this Summer.




I don't think I could wedge in the 7" mufflers beside my tank comfortably but I could do the 4" ones for sure.

If I do add these, I am assuming the longer (12" vs 22") the better or not? Also, where would you want to place them to get the best drone elimination? In other words, close as possible to the Flowmasters or closer to the tips?

I want to make sure I do this right and don't shred my exhaust system playing around with this.

Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614653
05/02/14 10:56 AM
05/02/14 10:56 AM
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Indiana
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YO7_A66 Offline
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""I am assuming the longer (12" vs 22") the better or not?""

You want to try and add the largest (diameter & length) muffler that you can fit into the space.

Magnaflow makes 4", 5", 6", and 7" diameter mufflers for that location.

http://www.magnaflow.com/02product/02muffler.asp


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Need a Quieter Muffler - Please Help [Re: YO7_A66] #1614654
05/02/14 11:29 AM
05/02/14 11:29 AM
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Lakeland FL
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floridian Offline
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I would contact Accurate Exhaust in Roseburg, OR and get their advice.

Re: Need a Quieter Muffler - Please Help [Re: YO7_A66] #1614655
05/02/14 12:33 PM
05/02/14 12:33 PM
Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni Offline OP
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Quote:

""I am assuming the longer (12" vs 22") the better or not?""

You want to try and add the largest (diameter & length) muffler that you can fit into the space.

Magnaflow makes 4", 5", 6", and 7" diameter mufflers for that location.

http://www.magnaflow.com/02product/02muffler.asp




Would using a resonator as opposed to a glasspack make more sense? Isn't that what resonators are for? Which would be a better way to go as they are both about the same size/shape/price??

Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614656
05/02/14 02:08 PM
05/02/14 02:08 PM
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Indiana
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YO7_A66 Offline
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I was confused in the terminology so I asked a Magnaflow Tech to tell me the difference between a muffler and a resonator. This was his answer:

""Mufflers and resonators are one in the same. We use the term resonator when two mufflers are used in line of one another."

When I pulled the original style resonators off of my Challenger, I was surprised to see a "straight thru" design. It was an oval shape so it would have more noise suppression than a glass pack type (round) style of muffler in that location.


The round straight-thru mufflers will not have as much noise suppression as the round "chambered" style. The chambered style will be more restrictive than the straight-thru style. So it depends on what you are after. The space that you are wanting to add a muffler is very restrictive, so a round muffler is about your only choice.

I have read that when trying to stop a droning noise, a second muffler (resonator) is used to break up the sound waves. Adding the second muffler will also change the sound depending on the selection of muffler.
If you want to change the sound of the exhaust a lot, then you may want to start over with your existing muffler selection. If you want to quiet down the exhaust a little bit, then adding the second muffler may do that. Then the type of muffler will then determine the final loudness and the performance level.

It appears that you might end up with two mufflers per side due to the size of the exhaust, the size of the engine, and you do not want to lose performance.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Need a Quieter Muffler - Please Help [Re: YO7_A66] #1614657
05/02/14 02:36 PM
05/02/14 02:36 PM
Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni Offline OP
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Yes, I like the Flowmaster sound but just too loud! It also seems to hit a perfect resonance in the cabin right at 60 mph or so where it just makes my head want to explode.

I am fine with adding the second glasspack/resonator on each side. I just don't have the money/time to experiment with multiple sets of mufflers here.

If my main goal is to keep the sound but quiet what I have the most (eliminate drone), what do I do?

Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614658
05/02/14 09:57 PM
05/02/14 09:57 PM
Joined: Dec 2004
Posts: 1,176
Crockett ,TX
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98RAM1500 Offline
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A glasspack on each side behind the tips (if you have tips) will calm the noise down alittle more and it takes the drone out, there are a lot of people I know that use glasspacks as resonators.

Probably 18" glasspacks would for sure do what you want it to. They are usually 3 1/2 to 4" diameter shells and come in sizes from 12" to 36", the longer the quieter it will get which will help get rid of the drone, but like I said which ever the longest you can fit beside the gas tank.

Re: Need a Quieter Muffler - Please Help [Re: 98RAM1500] #1614659
05/02/14 10:31 PM
05/02/14 10:31 PM
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North Carolina
cjskotni Offline OP
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Would these reduce the noise quite a bit? I think I should be able to squeeze these right beside the gas tank.

http://www.summitracing.com/parts/mpe-18129/overview/

Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614660
05/02/14 11:23 PM
05/02/14 11:23 PM
Joined: Dec 2004
Posts: 1,176
Crockett ,TX
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98RAM1500 Offline
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yeah those are the 18's, just remember that it will make the overall exhaust sound alittle quieter aswell.

Last edited by 98RAM1500; 05/02/14 11:25 PM.
Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614661
05/03/14 12:30 AM
05/03/14 12:30 AM
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NC, USA
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davenc Offline
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I have not looked under a B-body like yours but I would be surprised if you could not fit something larger than 4" round. You will want the largest resonator that you can fit in my opinion. The mufflers/resonators are still a straight thru design, so I would never consider them "quiet" with the size motor you have. I sent you a PM with info on the shop I used (rjscustompiping.com) here in Raleigh. My suggestion would be to talk with Ron and let him put your car on the lift and tell you what he thinks will fit.

Re: Need a Quieter Muffler - Please Help [Re: YO7_A66] #1614662
05/03/14 02:13 AM
05/03/14 02:13 AM
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Highland, MI.
Sunroofcuda Offline
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If the Magnaflow tech said mufflers & resonators are the same thing, that could be true sometimes, but also not true a bunch of the time. If you were going to run a muffler & a resonator in the same system or bank, the muffler would not need to be straight-through, but resonators are always straight-through. Resonators should not add more restriction to a system. You could use Ultra Flows as resonators, glasspacks, Corsa, etc. - as long as they are straight-through. Beware though, many glasspacks downsize internally & that will build backpressure. On your Charger exhaust, you'll have room for 18" long body & 4" diameter - maybe a little larger diameter. On the noise control package from the factory on these cars, the resonators were 4" round & the bazooka tips connected directly to them via sheetmetal screws. I did a very similar setup on my '73 Rallye 340 car using Walker 4" round mufflers - see photo.


No Man With A Good Car Needs To Be Justified
Re: Need a Quieter Muffler - Please Help [Re: Sunroofcuda] #1614663
05/03/14 10:47 PM
05/03/14 10:47 PM
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Posts: 1,526
North Carolina
cjskotni Offline OP
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Ok guys,

I went ahead and ordered the 18" Magnaflows. I may not get them on now as your picture just reminded me that I need to get a set of the bazooka tips for my Charger and that will dictate where the Magnaflows need to go exactly.

When I have some spare money and this car is running somewhat reliably, I will get these so I can have everything put together at once the right way.

Thanks guys! I am hoping this will kill the drone and quiet down this exhaust somewhat.

Re: Need a Quieter Muffler - Please Help [Re: cjskotni] #1614664
05/03/14 10:53 PM
05/03/14 10:53 PM
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Canton, Ohio
Crazy68Dart Offline
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Not sure what kind of power you are making.. could consider going to a 2.5 or 2.75" tail pipe. That will help too.


383, Hemi 4-Speed, AlterKtion, D60
Re: Need a Quieter Muffler - Please Help [Re: Crazy68Dart] #1614665
05/17/14 12:00 AM
05/17/14 12:00 AM
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Moncton, New Brunswick
hemidart1 Offline
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here is my car with Dynomax turbos (tti system)
https://www.youtube.com/watch?v=to0Z2Z3GqD8&feature=youtu.be


1967 Hemi GTX
1969 Chrysler 300
Re: Need a Quieter Muffler - Please Help [Re: hemidart1] #1614666
05/21/14 02:40 PM
05/21/14 02:40 PM
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Motor City
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6PKRTSE Offline
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I have 40 series Flowbastards on my Charger also & got sick of the resonation while driving. I added the 18" Dynomax glass packs to the tail pipes like the factry resonators & man what a difference. So much quieter, no more resonating & my ears don't ring for hours after driving it for awhile now. Wish I would have done it years ago now.


1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
Re: Need a Quieter Muffler - Please Help [Re: 6PKRTSE] #1614667
05/24/14 07:06 PM
05/24/14 07:06 PM
Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni Offline OP
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cjskotni  Offline OP
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Quote:

I have 40 series Flowbastards on my Charger also & got sick of the resonation while driving. I added the 18" Dynomax glass packs to the tail pipes like the factry resonators & man what a difference. So much quieter, no more resonating & my ears don't ring for hours after driving it for awhile now. Wish I would have done it years ago now.




Thanks for the reply! I have a set of the 18" Magnaflow glass packs and tips to get put on when I have the time to take her in to the exhaust shop. I am hoping I will have similar results!

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