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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: BigBlockMopar]
#887718
12/25/10 08:27 PM
12/25/10 08:27 PM
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Joined: Jan 2003
Posts: 25,791
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,791
Rio Linda, CA
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Like the folks said, 3" and quiet don't go together.
The INTERNET, the MISinformation superhighway
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: BigBlockMopar]
#887719
12/25/10 08:54 PM
12/25/10 08:54 PM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
MidPenMopar
Looking for fun? Keep looking
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Looking for fun? Keep looking
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
Sounds good enough for a musclecar-Mopar to me!
No H or X pipe in the exhaust?
I still hope my Chrysler will be quieter though.
I have a H pipe in the system, but an X pipe may be quieter at idle. 
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: BigBlockMopar]
#887721
12/26/10 06:08 PM
12/26/10 06:08 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
For an upcoming project car of mine, I'm trying to build a pretty quiet 3" diameter full exhaust system.
I'll be using a Summit 3" headerback system (SUM-680141-NM), accompanied by an X-pipe, a pair of Dynomax 23" long Super Turbo mufflers (17769) and a pair of Dynomax 3" Race bullets (24215) acting as resonators in the back next to the fuel tank.
Is anyone running such a similar exhaust system perhaps and what are your findings/ideas?
exhaust on my 5th ave is a big single using a 17769 and a summit 3" glasspack as a resonator. very reasonable volume level...having 2 of each should be nice and quiet. heavy, though.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: BigBlockMopar]
#887722
12/27/10 10:12 AM
12/27/10 10:12 AM
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Joined: Jan 2006
Posts: 8,162
USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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To more fully quiet your system consider either the Dynomax 17299 (SS more expensive) or 21313 muffler listed here: http://www.a-1performance.com/rv/The back pressure of either of these "straight through" mufflers is probably the same or better than the Dynomax 23" long Super Turbo mufflers (17769) The little horizontal stubs are "tuned" by trimming their lengths. What length do you intend to start out at? The 'Tone Generator' program at this link can be used to match up the exhaust system 'resonance' at some particular cruise rpm that you want to eliminate to the approximate length of the stub: http://www.nchsoftware.com/download/index.htmlThe math and science of the stubs is covered at the link below under the B. High Pass Filters section midway down the webpage: http://paws.kettering.edu/~drussell/GMI-Acoustics/Filters.html
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: BigBlockMopar]
#887723
12/27/10 11:25 AM
12/27/10 11:25 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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BBM, It is very possible to make a darn quiet system. We did it and you can too. You can use a good X-pipe system and 5" by 11" by 22", 3" offset in and center out Goerlich XLERATORs and get it really quiet as compared to most large engined, large pipe-equipped cars. You can also grab a copy of Dad's book at any bookstore "How to Build a Max Performance Pontiac V8" and look at all our charts and graphs. http://www.amazon.com/How-Build-Performa...9829&sr=8-1 I can email you my charts and you can take a look at our relative sound numbers and watch and listen to a couple of these videos. Based on its 117.5 mph speed (a month ago) and the 4100 pound weight plus its huge frontal area, the numbers show that the engine in the car makes about 550 HP at the flywheel and it is very, very quiet at the track and on the street. http://www.youtube.com/watch?v=Ta6kP3itZx8http://www.youtube.com/watch?v=LWO4G-7pwr4&feature=relatedBe very glad to help you with more info, email me at thand@kc.rr.com anytime. Tom Hand
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: Kirby]
#887729
12/29/10 03:44 PM
12/29/10 03:44 PM
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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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Why even bother with 3" exhaust off manifolds? You've already choked it down to 2-1/4" with the logs.
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: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: feets]
#887730
12/29/10 04:01 PM
12/29/10 04:01 PM
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Joined: Jan 2005
Posts: 1,527
minnesota
Kirby
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,527
minnesota
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Quote:
Why even bother with 3" exhaust off manifolds? You've already choked it down to 2-1/4" with the logs.
Maybe not the best way- but it fits! I had a hard time spending huge bucks on headers- then having to take a hammer to them. 
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: Kirby]
#887731
12/29/10 04:27 PM
12/29/10 04:27 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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stock 68 383 rr with 2.5" X pipe, dynomax super hemi turbos through the hp exh manifolds. it was somewhat quiet but had a bad resonance between 2 and 4K, 35 to 45 mph, i had to add resonators just before the tips like the hemi RR had, they are magnaflos 22" or so long, very quiet now, when i open it up it sounds like the blues mobile jumping over the opening bridge!!
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: ademon]
#887732
12/29/10 04:42 PM
12/29/10 04:42 PM
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Joined: Sep 2004
Posts: 1,281
wisconsin
kmfdm
pro stock
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pro stock
Joined: Sep 2004
Posts: 1,281
wisconsin
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I like mine loud, but was thinking about ditching the flowmasters. Any suggestions?
74 Dart Sport
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Re: Quiet full length 3" exhaust system (Dynomax mufflers).
[Re: challengermike]
#887735
12/31/10 06:10 PM
12/31/10 06:10 PM
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Joined: Jan 2003
Posts: 17,918
Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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Quote:
I put a 3 inch summit system on my old 69 coronet.It had a 499 in it and it was very loud.So i tired to switch the mufflers to some turbo mufflers,it was still loud.Then i put an h pipe on it and some edelbrock mufflers(23 inch long ones)and it was very quiet.Almost too quiet.When i sold the car i put a mild 440 in it and you almost couldnt even hear it running,lol
Perfect example, it's all about the combo. You can make any system quiet. My old DartSport ran 9.90's in the 1/4 through a 3.5" X-pipe with Magnaflow's and turnouts. If it had tailpipes it would be stealthy. My Dart has about a foot of pipe and then 3.5" Pypes stainless mufflers and it is pretty loud. An X-pipe and more pipe would make it perfect.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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