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Need a Quieter Muffler - Please Help
#1614632
05/01/14 05:05 PM
05/01/14 05:05 PM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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Guys, I am thinking about going to a quieter muffler on my Charger as it drones anywhere over 2500 RPM or so. I would like to be able to hold a conversation in the car without screaming while I drive down the road.  What's on there now are Flowmaster 40 series which sound awesome but this gets old after 10 minutes. I realize this won't be a quiet ride (499 stroker) but I want something quieter while still sounding somewhat 'throaty'. I have 3" exhaust from the headers to the tips. I have read that Dynomax has some good options but I see several types (VT, Turbo, UltraFlo, etc) and I am unsure of the difference. I need a muffler with a offset inlet and center outlet both at 3". I could go aluminized steel or stainless. Any recommendations for a somewhat quiet muffler, still sounds decent, for a STREET car? I don't care about absolute performance here, more for a nicer ride quality. 
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614633
05/01/14 05:24 PM
05/01/14 05:24 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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Dynomax (not sure which ones but I hear the VT (the one with the flap) that the spring rattles) plus some glasspacks alongside the rear leaf springs
live every 24 hour block of time like it's your last day on earth
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614634
05/01/14 05:35 PM
05/01/14 05:35 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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The Dynomax VT does have issues w/ the flaps rattling. The Dynomax super turbos are much quieter, but hurt the power. Yes, it is noticeable. The Dynomax Ultra-Flow is a good choice. MORE flow and quieter than the Flowmaster 40. The Hooker Max Flow is basically the same thing as the Dynomax Ultra Flow. The Hooker Aero Chamber is a little quieter than the Ultra Flow and Max flow, but louder than the turbos. Still make great power though. These would be my choice if you want power, but reasonably quiet. 
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614636
05/01/14 05:40 PM
05/01/14 05:40 PM
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Joined: Apr 2010
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CT
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614638
05/01/14 05:57 PM
05/01/14 05:57 PM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
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If you are considering adding a new muffler and a glass pack, how about adding a second muffler to your existing exhaust and see if that helps?
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Need a Quieter Muffler - Please Help
[Re: YO7_A66]
#1614639
05/01/14 07:19 PM
05/01/14 07:19 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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classic industries has magnaflow glasspacks: 18" shell/22" length/4" dia/3" inlet/outlet #18129 $51.99 ea with 15% off paying with visa "classic?". what YO7 said I'd add those before messing with the rest of the system. I've never run flowmasters but the flowbastards moniker the one guy put on em way back always stuck in my head, that they were way too noisy. yeah you gotta change something for your peace of mind
live every 24 hour block of time like it's your last day on earth
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614640
05/01/14 07:38 PM
05/01/14 07:38 PM
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Joined: Aug 2003
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Mt.Gilead, Ohio
OhioMopar
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I put 2.5" Pypes Violators on my Bee and it sounds awesome. I don't know how they flow, but looking through them, I would have to say well.
1969 Dart GTS 340
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Looking for the original block for my Bee. The last 4 are 7449
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Re: Need a Quieter Muffler - Please Help
[Re: Dan Halen]
#1614644
05/01/14 09:45 PM
05/01/14 09:45 PM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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Thanks for the suggestions so far, guys! I am a bit ignorant in the science behind exhaust acoustics so please forgive me. Can simply adding the glasspack type mufflers behind the Flowmasters really quiet it down that much? I saw the Magnaflows and Dynomax has their version of these as well. I am alright with trying simply adding the glasspacks but I am wondering if I am not happy and then have to take it in again to swap the Flowmasters out, if I should just do everything at once? I hate to ditch these things as they sound so bad ace outside the car but the drone is just killing me. Anybody here just added the glaspacks behind a noisy muffler and gotten really good results or should I just swap out the Flowmasters as well? Would the Dynomax Ultra Flow + glasspacks be too quiet or still beefy enough? 
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Re: Need a Quieter Muffler - Please Help
[Re: davenc]
#1614648
05/01/14 11:34 PM
05/01/14 11:34 PM
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Joined: Jul 2007
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North Carolina
cjskotni
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Quote:
I run Dynomax Ultraflows under the floor with a Magnaflow straight-thru muffler by the gas tank in my E-body, and I don't consider it too quiet, but of course that is a subjective matter. If you look for a recent post by Y07_A66 you will see some posts from me with acoustic sound levels comparing the Ultraflows by themselves versus two mufflers on both sides. The sound plots came from a smartphone app. Adding the second muffler on each side did make a substantial improvement.
Where are you in NC? I am in the Raleigh area.
Apex, NC here!
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Re: Need a Quieter Muffler - Please Help
[Re: davenc]
#1614650
05/02/14 09:01 AM
05/02/14 09:01 AM
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Joined: Jan 2003
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Indiana
YO7_A66
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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.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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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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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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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.
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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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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
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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.)
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Re: Need a Quieter Muffler - Please Help
[Re: YO7_A66]
#1614655
05/02/14 12:33 PM
05/02/14 12:33 PM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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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??
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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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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
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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.)
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Re: Need a Quieter Muffler - Please Help
[Re: cjskotni]
#1614660
05/02/14 11:23 PM
05/02/14 11:23 PM
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Joined: Dec 2004
Posts: 1,176
Crockett ,TX
98RAM1500
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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.
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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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Joined: Jan 2003
Posts: 8,392
Highland, MI.
Sunroofcuda
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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
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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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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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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. 
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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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Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
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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
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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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Joined: Jan 2004
Posts: 4,563
Motor City
6PKRTSE
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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.
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1970 Challenger R/T, 528 Hemi
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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.
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Re: Need a Quieter Muffler - Please Help
[Re: 6PKRTSE]
#1614667
05/24/14 07:06 PM
05/24/14 07:06 PM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
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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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