Suggestions wanted for QUIET good flowing mufflers (sleeper build)?

[493 Mike]

Thanks for your help here.
Mike

 

[HawkRod]

I'm interested too. I want my Road Runner as quiet as possible.

 

[33 IMP]

What size pipe do you wanna use, Mike? And how much room have you got?
I'm using a magnaflow 3"in/out on my Opel that's pretty quiet cause of a 24"case. It's not a sleeper however.
If I was redoing them, I'd look thru the Jones exhaust catalog at summit. Seems like quite a few stainless mufflers at good prices. (Quiet power?) 18 pages, you could find something. (45"long glasspack?).

 

[33 IMP]

How about a long a$$ glasspack in front of the biggest triple pass that will fit in the muffler area? I've got a 5x12x24 Flowmaster under my 62, but it's still a long ways from what I'd consider "quiet".

 

[j-c-c-62]

I think an aspect I would favor for best sound reduction besides a proven effective muffler, is simply a secondary muffler (resonator) of likely a different, size, brand, design, tuning, etc to help take down the widest sound band and capture anything the main muffler doesn't.
Unfortunately, that adds costs, weight, space, complexity, etc, but in engineering seldom is anything for free.
However, a simple crossover at the minimum should be part of the solution.
And get the tailpipe all the way out the back, not under, pointed down or at the side.
Full length wrapping couldn't hurt.

 

[Jeff Peterson]

Jimmy Addison style

 

[j-c-c-62]

How about a long a$$ glasspack in front of the biggest triple pass that will fit in the muffler area? I've got a 5x12x24 Flowmaster under my 62, but it's still a long ways from what I'd consider "quiet".

I would love to know what difference in sound it would make if your system was set up in the reverse order, if any.

 

[Darter6]

I would check with Accurate Exhaust. They are the most factory style/sound that I know of.
Maybe contact them and ask what they think.
I did a 340 4 speed 70 Duster and got factory stock replacements from them (years ago) I loved the sound.
Just a thought..

 

[33 IMP]

I would love to know what difference in sound it would make if your system was set up in the reverse order, if any.

That's not my system, and none of mine are "quiet".
It's just a packaging suggestion whereby a long glasspack can most likely easier fit, easier than after the muffler and tailpipe over the rear. Not a lot of room b3tween the gastank and springs for a long glasspack.
(My three hiperformance systems use 1. 70 series huge flowmasters, 3.5 in/out, full length tailpipes. 2. Hooker aero's, 3.5 in/out and turndowns 3. Magnaflow 3" in/out 24"case, turnouts in front of tires. #3 is quietest of the bunch)
This doesn't count the 3" truck Flowmaster on my dually, of the 4" one on my diesel. (Both singles, both quiet!)

 

[j-c-c-62]

That's not my system, and none of mine are "quiet".
It's just a packaging suggestion whereby a long glasspack can most likely easier fit, easier than after the muffler and tailpipe over the rear. Not a lot of room b3tween the gastank and springs for a long glasspack.
(My three hiperformance systems use 1. 70 series huge flowmasters, 3.5 in/out, full length tailpipes. 2. Hooker aero's, 3.5 in/out and turndowns 3. Magnaflow 3" in/out 24"case, turnouts in front of tires. #3 is quietest of the bunch)
This doesn't count the 3" truck Flowmaster on my dually, of the 4" one on my diesel. (Both singles, both quiet!)

I hear you on the difficulties of my suggestion (pun intended), but it would have been a worthy and informative Engine Master's comparison IMO

 

[hacksaw]

im going with the flow master and using a glass pack as a resonator with some paint and a turn down. all nicely tucked up out of the way.

 

[fullmetaljacket]

Dynomax Ultra Flow's. Hands down.

 

[Nirvana]

I like to copy Pypes “hybrid” system, 3” head pipes off the collectors, 3” x pipe and neck down to 2.5” at the muffler inlet. Then run dynomax ultra flos, 2.5” offset/offset will be the quietest.

 

[496 polara]

The longest case that will fit. Dynomax Super Turbo if you can add a resonator for the drone. Long ultraflows will be tame until you get on it. The Pypes Race pro if they built it in a longer case.Same with the Borla Pro xs.
I have 18" magnaflow to go on my Duster but not installed yet.

On my 454 82 Chevy C10 I used 4 mufflers.Two magnaflow before that rear axle and two super turbo under the bed. Hard to do on most cars but it is quiet!

 

[OKDart]

Some Imperials have small mufflers/resonators ahead of the regular muffler and Imperials have 440's and are very quiet. I took note of that and put 12" glass packs in front of the turbo mufflers in my '70 Roadrunner. I like the way it sounds now, but if I ever want it more quiet, I can still put resonators on the tailpipes too.
Top pic is Waldron exhaust for 1962-66 Imperial.

 

[j-c-c-62]

Some Imperials have small mufflers/resonators ahead of the regular muffler and Imperials have 440's and are very quiet. I took note of that and put 12" glass packs in front of the turbo mufflers in my '70 Roadrunner. I like the way it sounds now, but if I ever want it more quiet, I can still put resonators on the tailpipes too.

View attachment 1893646

It has been done the other way, and I suspect the Imperials were the way you mention mainly because that was the easiest solution for OEM space wise as others have noted. My goal would be the best configuration, and what that is has yet to be proven. Adding a third would likely get you close.

 

[1 Wild R/T]

Back in the day the Imperial mufflers were the sleepers choice... Originally Imperials used single exhaust... So the single muffler supported a 440... Very quiet stock.. Use two and they would easily support big horsepower..

The picture above of Jimmy Addison's "Silver Bullet" is a modern interpretation of what was originally (back in the 60's) four Imperial mufflers....

 

[33 IMP]

Back in the day the Imperial mufflers were the sleepers choice... Originally Imperials used single exhaust... So the single muffler supported a 440... Very quiet stock.. Use two and they would easily support big horsepower..

The picture above of Jimmy Addison's "Silver Bullet" is a modern interpretation of what was originally (back in the 60's) four Imperial mufflers....

.....and eventually the quiet wasn't foolin anybody.
(I bet they could still hear the solid lifter hemi.)

 

[fullmetaljacket]

Back in the day the Imperial mufflers were the sleepers choice... Originally Imperials used single exhaust... So the single muffler supported a 440... Very quiet stock.. Use two and they would easily support big horsepower..

The picture above of Jimmy Addison's "Silver Bullet" is a modern interpretation of what was originally (back in the 60's) four Imperial mufflers....

Jimmy's Bullet allegedly had four Cadillac mufflers. Imperial mufflers I suspect would do the same job.

 

[OneWheelPeel]

I just had a system built with Flowmaster flowfx mufflers, I have a wussy 318 but it’s pretty quiet. Somehow quieter than my 2000 Crown Vic with the old style flowmasters on an otherwise stock exhaust including catalytic converters.