Technical Is there any straight through muffler that is quiet ?

Just installed fairly expensive straight through mufflers on the old Ford, SBC. Am disappointed (,much too load.) I like the dual deep mellow tone that I thought straight through mufflers can provide & thought I had found some, Nope. Money waisted. I had a few years ago that were great but no longer available Does one have to go to the wider muffler with a turn to get it quieter ?. I did,nt want to put a big gloppy mufflers underneath.

 

I was under the impression that all straight through mufflers were loud. HRP

 

define quiet
what did you use?
I have installed the hushpower mufflers and those were the quietest ones I have installed
my SBF has cheap ole thrush glass packs and is reasonably quiet. Its is ran out the back.
I have the same behind a 350, they exit under the bed, just behind the cab. Lots of drone noise while driving.

 

Find some that offer different lengths.

Yrs ago I put duals with 48" straight thru mufflers on my 64 bonny, sounded pretty much the same as stock.

My muffler guy just laughed and said if you wanted more noise you should have went with a shorter muffler!

 

Define quiet
Well ,so I can hear my Wife talk in the car, hear the radio.not hear a drone that drives one nuts after 20 miles. Don,t know how old you are but my Wife & I are pushing 80 , as one gets older one likes quieter. I know what you are going to say: "well then why are you into old hot rods" Mufflers I used are Porters Made in US.

 

Good tip. I imagine you could go on YouTube and listen to different muffler sounds .

 

How is the exhaust mounted? Do you have a crossover pipe?

 

Smithy’s are fairly quiet.

 

Quiet like the library.......no.........perfectly acceptable.....pretty much all of em'

 

Back in the 50's we ran Ford midgets and some of the tracks had maximum sound limits so we had to run mufflers.
The association had a spec muffler everybody had to run. It was a stock Pontiac straight through, about 6 inches in diameter and about 34 inches long. Very quiet.

 

I chose Porter Mufflers on my roadster for the same reason, they have mellow tone and wake up when you step on it. I really like them when I’m driving with the top down!


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do ya have room for something like these?
https://www.summitracing.com/parts/...MImsOC1dbX6gIVBqSzCh2fxAUMEAQYBCABEgIuu_D_BwE

the exit point of the exhaust has a lot to do with it as well.
the wife hates the drone from the glasspacks behind the 350, but the same muffler behind my 302 doesnt drone. Weird how that works

 

Long glass pack for quite and short for fun.

 

I put a pair of short Porter stainless steel packs on my '40 with tailpipes run all the way to the back. I was surprised how quiet it is in the car now that I have the insulation and interior installed.

 

What he said. Most buy the short glass pack because they're cheap. Go with the long glass pack or a long smithy's

 

I used the 20" Porter glass packs on my 40. Had a nice sound at idle and good sound when you would get into it. You could carry on a conversation with passenger without yelling with windows down at 70..

 

Magnaflow, longest glass pack they offer is fairly quiet, I don't remember what the length was on the ones I used.

 

Never-Rust out of Pennsylvania...not too noisy on the freeway, and they are reasonably priced and stainless steel to boot!
412-766-7775

 

In 1959-60 they were called “Corvette Off Road” tube mufflers.

Hello,

When we had our 1958 Chevy 348 Impala, we needed some straight through mufflers to give us less restriction, but still be street legal. Since it was a Chevy dealer catalog parts number, it was legal for stock car class racing at the dragstrip. The mufflers by themselves and no tail pipes made a very noticeable sound. Normal driving was a little on the loud side since the end of the mufflers were near the middle of the Impala. When we had our friend the neighborhood muffler shop owner measure everything, he just installed the tube mufflers first and we had to come back a week later.

With the tube mufflers, the 348 sounded perfect, but loud. Acceleration down any street was tremendous and thrilling. After the muffler guy had all of the exact pipes ready, he welded and installed piping out to the rear. Now, the sound was very quiet and those that rode in the Impala were impressed with the slightly “toned” idle. The times at the drag strip did not change very much. But it was slightly better. Tube versus off set stock mufflers were definitely better.


Jnaki

As far as the length of the tube corvette “off road” mufflers were, I have no idea. But they fit nicely where the stock mufflers used to be underneath and tucked in nicely. They are still around from different sources. Obviously, they are re-manufactured versions. The added long tail pipes definitely made a quieter sound, so talking inside with the windows rolled down on a hot summer night was easily done, without shouting.

As nice as Magnaflow systems are, the one version of tube mufflers from Magnaflow offers, makes a popping sound on some of the high performance cars in these modern days. That is not worth the cost or effort. It makes the modern car sound like a backfiring, mistuned car. Not too nice for those people walking around. There is this young guy in the neighborhood that thinks his fastback sedan is the cat’s meow with the popping sounds when he lets off of the gas. It just sounds awful and does nothing for performance. YRMV

https://www.jalopyjournal.com/forum/threads/what-mufflers-do-you-run-on-your-hot-street-car.1130653/page-2#post-12879733

 

Dynomax Super Turbo 17749... They will get a real nice tone after a few thousand miles..

 

If you want it to be quieter inside the car but still fairly loud outside the car, go with the longest, thickest muffler you can find. That will help some. That is what Magnaflow recommended me do on my 57 Chevy. The short MF's were just too loud for me. I couldn't hear my tunes!

Also, the Dynomax Super Turbos are good, as well. I have them on another car. A lot of it will depend on the engine, cam timing, length of exhaust, crossover, etc.

 

Don't forget exhaust pipe diameter.
No matter what type or size of the muffler, if the exhaust size is too small for the engine size, the exhaust will still remain snappy/cackling. Changing from 2" to 2.5" can make a massive improvement.

 

....a quiet "straight-through" muffler...??? Would this question be considered an oxymoron? Just wonderin'.
Definition of oxymoron
: a combination of contradictory or incongruous words (such as cruel kindness)broadly : something (such as a concept) that is made up of contradictory or incongruous elements.

 

i would think pipe diameter has the biggest bearing on things i built my exhaust from 2 1/2 inch stainless .next time id go for 2". 2" to let the noise out.should be a little quieter and easier to route

 

realative : not absolute or independent : COMPARATIVE
A drill could be considered quiet compared to a jackhammer.

 

You can make some generalizations about mufflers. If they're the acoustic wave absorption type (glass or steel packed), the longer the quieter. If they're the baffled type, for a given design the higher the cubic inch volume of the shell the quieter they'll be. It's basic physics. No magic involved.

Bob

 

When it comes to finding a muffler that sounds good to your ears I wouldn’t limit your search to just straight through mufflers. I’ve been using Walker SoundFX mufflers lately. They made our two SBC powered cars sound great and they are compact. The Smithy’s I put on first were the long ones but still pretty loud for some reason.
If you’re worried about restriction, I use a muffler with a core one size larger than the pipe in the system. For example, 2 1/2” core mufflers on a 2” or 2 1/4” system. Seems to work well.


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You can live with a muffler thats too quiet a lot better than one thats too loud. Same rule applys to picking a wife.
Magnaflow has some nice sounding mufflers, but in the end it comes down to what is quiet enough to suit you/her.
Might think about quiet mufflers and electric cut outs..........

 

My Cad has Flowmasters installed by the prior owner. They sounded good, but radiated a lot of heat so I put DEI muffler wrap on them. I was happy that it cut down the heat and was surprised how much it was quieted down especially the interior drone. I know both the mufflers and wrap are not traditional items.

 

sometimes you can add a crossover pipe before the mufflers and it will balance, quiet them down