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Really quiet muffler that flows 1/2 decent?
#1022457
06/29/11 12:57 AM
06/29/11 12:57 AM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
OP
I Live Here
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OP
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Just like it says. A friend wants his 360 to be really quiet but make a little more power, he is set on getting duals while he replaces his rusted out EX but wants it really quiet. Also what is a good size, I am thinking 2.25  The engine is a 5.9 magnum with heads shaved .030 very mildly ported heads, we are gonna throw in a roller cam from a 5.2 mag since we have it sitting around and it is a hair bigger. We are also gonna try one of the new hughes air-gap intakes since the motor is EFI and mabey a set of 1.7 MP roller rockers and some GM v6 behive valve springs. I may try to find a cheap set of the bigger 92 93 ex manifolds while we are at it since he wants it super quiet and cheap.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Really quiet muffler that flows 1/2 decent?
[Re: MAVERICKSHEMI]
#1022464
06/29/11 05:46 PM
06/29/11 05:46 PM
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Joined: Jan 2003
Posts: 4,296
Chicago, IL
TonyS451
master
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master
Joined: Jan 2003
Posts: 4,296
Chicago, IL
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Dynomax Hemi superturbo is a good one for quiet performance. Its a bit longer than the regular superturbo, but I think it only comes in 2 1/2". Ultra flo is not what I would call a quiet muffler. Maybe more quiet than some, but for what you are looking for, it will be too loud. Great performing muffler though...
2 kids and a dog
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Re: Really quiet muffler that flows 1/2 decent?
[Re: TonyS451]
#1022465
06/29/11 05:53 PM
06/29/11 05:53 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Dynomax Hemi superturbo is a good one for quiet performance. Its a bit longer than the regular superturbo, but I think it only comes in 2 1/2". Ultra flo is not what I would call a quiet muffler. Maybe more quiet than some, but for what you are looking for, it will be too loud. Great performing muffler though...
a 2 1/4" dynomax super hemi turbo is availiable. its the same size as a stock street hemi.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: HotRodDave]
#1022468
06/29/11 07:01 PM
06/29/11 07:01 PM
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Joined: Feb 2003
Posts: 1,637
Florida
GMP440
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,637
Florida
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Check AP Exhaust Products. I had their MSL mufflers from 1990 to 2003 on my 68' Coronet with 318. They are regular passenger stock mufflers .Excellant mufflers and lasted me 13 years. They are quiet and have the correct back in the day Mopar muffler sound. I always loved the way they sounded. They sounded excellant and the performance was really good. If you go on the AP Exhaust website they have downloadable catalogs for different year cars. These mufflers will have what your looking for. When I replaced them in 2003 I should have went with those mufflers but insteadwent with their lifetime muffler and this was done at the same muffler shop. To get a good idea of how they sounded go on Youtube and type in "80 Steps to Jonah". It was a movie with Wayne Newton and Sal Mineo. Sal drove a gold color 69' Charger. In the scene you can hear the exhaust. Look for the scene where he picks up the young looking Wayne Newton. Here is the link. http://www.apexhaust.com/index.php/Catalogs
Last edited by GMP440; 06/29/11 07:05 PM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: JohnRR]
#1022471
06/29/11 07:26 PM
06/29/11 07:26 PM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
Quote:
http://www.youtube.com/watch?v=3aiKrwGXFOo&feature=related
The above link is 3" exhaust with 14" Dynomax ultraflo muffler. Sounds rather loud to me. check his other videos, he has done alot of research on diffrent mufflers.
3" will be a lot louder than a 2.5, or 2.25 for that matter, system.
John,thats why I turn my hearing aid down when I drive the wagon!! 
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Re: Really quiet muffler that flows 1/2 decent?
[Re: 62maxwgn]
#1022472
06/29/11 07:30 PM
06/29/11 07:30 PM
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Joined: Jan 2003
Posts: 74,942
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,942
U.S.S.A.
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Quote:
Quote:
Quote:
http://www.youtube.com/watch?v=3aiKrwGXFOo&feature=related
The above link is 3" exhaust with 14" Dynomax ultraflo muffler. Sounds rather loud to me. check his other videos, he has done alot of research on diffrent mufflers.
3" will be a lot louder than a 2.5, or 2.25 for that matter, system.
John,thats why I turn my hearing aid down when I drive the wagon!!
I opted for corrective surgery instead of hearing aides , should have gotten the hearing aides I guess , but even when I was deaf the DRONE is what drove me crazier .
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Coronet-R/T-Rag]
#1022478
06/29/11 11:48 PM
06/29/11 11:48 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
OP
I Live Here
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OP
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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The more I talk to him the more I think he is concerned with wanting them very quiet. I think I am going to look into the imperial mufflers.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Really quiet muffler that flows 1/2 decent?
[Re: gch]
#1022480
06/30/11 05:49 PM
06/30/11 05:49 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Here's the one I've been wanting to try: http://www.summitracing.com/parts/WLK-17853/?rtype=10It's 2 1/2" in, 2 1/4" out, 18" shell length. Lists to be a direct-fit for 68-76 Cadillacs, so it should flow pretty well if it was spec'd for that engine size. The Walker 17000-series is their turbo-muffler product line. $28 at Rock Auto, too!
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Re: Really quiet muffler that flows 1/2 decent?
[Re: JohnRR]
#1022482
06/30/11 08:45 PM
06/30/11 08:45 PM
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Joined: Apr 2010
Posts: 141
Ohio, USA
Donny
member
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member
Joined: Apr 2010
Posts: 141
Ohio, USA
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Quote:
Quote:
http://www.youtube.com/watch?v=3aiKrwGXFOo&feature=related
The above link is 3" exhaust with 14" Dynomax ultraflo muffler. Sounds rather loud to me. check his other videos, he has done alot of research on diffrent mufflers.
3" will be a lot louder than a 2.5, or 2.25 for that matter, system.
I just got into a discussion with a coworker (Ford racer) on this exact topic and he swears up & down that in regards to sound the size of the exhaust system has virtually zero effect on volume, it only effects the tone. I told him he was nuts. He's bringing me before & after video to watch of his Mustang when it had 2.5" and now with 3". He claims I won't believe my ears and is insisting just as a tip to not waste money on larger exhaust for purposes of sound alone. I'll see soon enough.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Donny]
#1022483
06/30/11 09:09 PM
06/30/11 09:09 PM
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Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,814
Kirkland, Washington
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Quote:
Quote:
Quote:
http://www.youtube.com/watch?v=3aiKrwGXFOo&feature=related
The above link is 3" exhaust with 14" Dynomax ultraflo muffler. Sounds rather loud to me. check his other videos, he has done alot of research on diffrent mufflers.
3" will be a lot louder than a 2.5, or 2.25 for that matter, system.
I just got into a discussion with a coworker (Ford racer) on this exact topic and he swears up & down that in regards to sound the size of the exhaust system has virtually zero effect on volume, it only effects the tone. I told him he was nuts. He's bringing me before & after video to watch of his Mustang when it had 2.5" and now with 3". He claims I won't believe my ears and is insisting just as a tip to not waste money on larger exhaust for purposes of sound alone. I'll see soon enough.
The Ford racer is nuts. Given the same set up (brands/configuration) a change from 2.25 to 2.5 to 3.0 will make a BIG difference.
I would not consider anything over 2.5 as quiet, it even in the 2.5 size you have to pic the muffs carefully if the motor is stout and you want quiet.
and not to go off-topic but once again I am reminded of my question Why no 2.75" pipes/muffs? Seems like such an ideal size. Not quiet though.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Tom Hand]
#1022484
07/01/11 12:58 PM
07/01/11 12:58 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
HotRod Dave, if you want the best of both worlds, save your money and buy some of these. I can tell you all you need to know about them and how they work on my car.
Tom -
Please give us the skinny on these. I searched thru some of your old posts for a clue but ran out of time.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: 360view]
#1022486
07/01/11 04:14 PM
07/01/11 04:14 PM
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Joined: Jan 2003
Posts: 1,231
Chicago, IL
PLUM_72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,231
Chicago, IL
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I agree with 360VIEW, Use 2 mufflers. Remember back in the day they used a muffler and a resonator to quiet things. Two mufflers will do something similar. Find a decent flowing type. I would also add a cross-over or x pipe to help quiet things as well.
1972 Dodge Challenger
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Fury Fan]
#1022487
07/01/11 06:51 PM
07/01/11 06:51 PM
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Joined: Jan 2008
Posts: 553
DE
Ply72rr
mopar
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mopar
Joined: Jan 2008
Posts: 553
DE
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Quote:
Quote:
HotRod Dave, if you want the best of both worlds, save your money and buy some of these. I can tell you all you need to know about them and how they work on my car.
Tom -
Please give us the skinny on these. I searched thru some of your old posts for a clue but ran out of time.
Waldron’s Exhaust
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Fury Fan]
#1022488
07/02/11 12:22 AM
07/02/11 12:22 AM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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FuryFan, I made the set on my 69 Cuda and they are quieter than stock when closed and as loud as Flowmasters when open. They have zero resonation when closed and they roar when open. They flow like stockers when closed and even though this is not anything to brag about, they pass as much air when open as the equivalent sized Flowmaster. They are expensive but offer a person the way to have the best of both worlds. For sure, they are not drag racing mufflers, they were not meant to be. I did a lot of tricks inside of mine to bump the air flow up and the ones that Waldron sells are darn near as good, air-flow wise. For our A- cars, the 18" cases will fit fine although you need to drop the nose down a tad to clear the 4" actuator needed. For Bs, you could use the 19" or 20" case size. The sound levels depend upon engine of course but I saw around 9 to 10 dBa difference in many rpm levels on mine. The first video is a true 1970 400 VOE GTO. The second is my car with the stocker VOE mufflers. Mine are louder than the VOE GTO versions. The set below in the photo is on a 1969 Cobra Jet 428 Torino. http://www.youtube.com/watch?v=Mwov5Kp0SCEhttp://www.youtube.com/watch?v=oX5i4_CQqb8&feature=relatedTom Hand
Last edited by Tom Hand; 07/02/11 12:26 AM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: 62maxwgn]
#1022490
07/02/11 09:32 AM
07/02/11 09:32 AM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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And that is a great question 62MaxWagon. I (and Waldron's do I believe) use a 304 st. st valve plate mating with 409 st. st. tubing. The dissimilar materials keeps the sticking from occurring; indeed, it did in 1969-1971 when the parts were all 409 st. st. Both of these stainless steels are resistant to rusting all the way away. St. st. 409 builds up a surface condition of light discoloration/oxidation that then tends to stay put.
With the new fuels we have, the issue is not like it used to be in 1970. Plus, none of us fire up the car and listen and then shut them off. Okay, so I do to show off the mufflers' sound but I have no worries about them sticking as know what I did to them internally. Most of us tend to drive the cars and evaporate the moisture from the mufflers more so then what people used to do when these cars were new and used for transportation. A small hole will help if you just start and then shut the engine off.
My mufflers are now going on 6 years old. The originals in 1970 lasted about two to four years max (I heard) but tended to stick and required you to tap the end now and then to break them free. The new generation versions do not.
The cool thing is they stay closed while they sit and when they open or close upon driver control, they chatter briefly while seating and unseating the valve. The videos may allow you to hear the very brief rattle. That comes from the plate being free to float on its shaft letting it always take the correct angle needed to seat. This slight chatter also tends to polish away anything that may be starting to build up and change the surface and cause sticking issues.
The actuator is the part than can wear out but it is outside and easy to replace. A few of the very early ones needed a modification to the rivet that held the arm on the rubber diaphragm but that part is well understood and the engineering change was instituted several years ago.
I have attached the original patent illustration. You can see how they worked originally. The changes we made simplified them and made them much better, longer lasting, louder when open, and quieter when closed. Plus they flow more exhaust gases when open, and the new materiel we used makes them virtually "forever" mufflers, not short lived ones like they were in 1969-1970.
Tom Hand
Last edited by Tom Hand; 07/02/11 09:36 AM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: HotRodDave]
#1022493
07/03/11 09:19 PM
07/03/11 09:19 PM
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Joined: Jan 2011
Posts: 15,806
Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,806
Central Florida
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I also have Walker "quiet flow" mufflers on my MP Magnum 360. I would say they are definetly as quiet as an OEM muffler. As far as flow, I can't tell. They are the only mufflers I have had on this engine. As mentioned by another member, quality is not all that good. It has only been a few months and I can already see some rust beginning at seams.
Facts are stubborn things.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: MadMatt]
#1022494
07/03/11 09:39 PM
07/03/11 09:39 PM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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Madmatt,
Good comments Matt. Here is why they are made like they are. A solenoid would cost more than the actuator plus the wiring and switch is more complex and expensive. The vacuum requires really inexpensive tubing and is simple to hook up and easy to adapt to anything. The 4" actuator lets cars with as low as about 10 inches of vacuum at idle easily build up enough vacuum in the reservoir to pull and hold them open. The spring that holds them shut has some force but the 4" actuator has enough "guts" to yank them open.
Tom Hand
Last edited by Tom Hand; 07/03/11 10:27 PM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: BigTerry]
#1022497
07/04/11 12:42 AM
07/04/11 12:42 AM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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You are right, they are high dollar pieces. Check on two Borlas for each one (one really really quiet and then one really really loud) and then it makes sense.
They really do have lot of parts cost in them and with most being either custom made and all st. st., it adds up very quickly. The actuator alone costs more than most Chinese (or other low cost) mufflers do.
Tom Hand
Last edited by Tom Hand; 07/04/11 11:19 AM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Tom Hand]
#1022498
07/04/11 01:54 AM
07/04/11 01:54 AM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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I'm interested in a quiet muffler too. My situation is a little different since the turbos will help reduce the noise too.
I have no need or desire for a switch pitch muffler.
I want quiet with as little back pressure as possible.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Really quiet muffler that flows 1/2 decent?
[Re: feets]
#1022500
07/04/11 11:17 AM
07/04/11 11:17 AM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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Feets, I'd use the largest straight-through muffler you can fit. The 5" by 11" by 22" Magnaflow or Goerlich Xlerator X141 I think both would be terrific for letting the turbocharged exhaust fly through and getting rid of the noise.
360view: Regarding the back pressure measurements: they will vary greatly depending upon load and gear and engine and car but I can tell you the difference in air flow through the mufflers closed and open is very similar to stock mufflers when closed (around 35% of an open pipe) and around 55 to 60% when open (around that what typical Flowmaster flows when configured with offset offset inlets and outlets). However, please recall that under highway speeds when the throttle is not too far open, the back pressure may not and likely will not be very high no matter what mode the muffler is in. Of course, if the throttle is wide open, the back pressure will be measurably different. If I have my Barracuda out soon, I can measure it one of these days for you.
Tom Hand
Last edited by Tom Hand; 07/04/11 11:18 AM.
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Re: Really quiet muffler that flows 1/2 decent?
[Re: Dakota_Don]
#1022502
07/09/11 11:17 AM
07/09/11 11:17 AM
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Joined: Jul 2007
Posts: 271
MO, USA
Tom Hand
enthusiast
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enthusiast
Joined: Jul 2007
Posts: 271
MO, USA
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Yes, have had three sets and they work very well on all but the really high HP, high compresion,large cubic inch engines. Dynomax is working on the new versions for these more powerful set-ups. We have a set on a low 12 second 360 powered 1968 Barracuda. They are very, very quiet at idle and cruise conditions, even with a 3.91. Once you put the coals to them, they open up and sound like the Welded UltraFlo. We also have a set on Dad's low 11 second Pontiac wagon. They tend to be louder as they are not the new versions intended for big engines BUT they are still surprisingly tame for such short mufflers with such short silencing zones internally. In both cases, there is NO DRONE. The Cuda runs tailpipes. The wagon has them at the rear with a shorter straight section of pipe following them. Please also visit this string and read the data presented. http://forums.performanceyears.com/forums/showthread.php?t=639125 Hope this provides enough data to help answer your question. If you are close to KC, I can help you install a set to listen to. Tom
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