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Crazy exhaust theory I have... Is it plausible or, am I stupid?

shady

shady

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For a long time now I've had this question/theory.
If you replace the straight pipe with glass packs, and not run any other mufflers, would it be quieter than just 1?

By my thinking, you'd still have a straight through full open exhaust. But you wouldnt have the loud as fock sound you usually get with a single glass pack.
Like if you have 4 in a row on each side. Would it actually be quieter?
 
I would believe more glass packs = more sound reduction.
I replaced a 14” one with a 18” one and it is quieter
 
Part of what makes a large single work so well is how the cylinders work with each other, both in creating the scavenging and also offsetting pulses taking the high spots out of the sound. Glass packs make noise, and I’d suspect straight pipe would sound better lol
 
tRustyK5 said:
The dyno disagrees...
Click to expand...
I forget, did they give a pressure reading on those test?

I remember the important part being straight through or close was better everywhere, and more important if size was decreasing or power increased. Mine are right at the point it may not make enough difference to change
 
I have flow master delta flow 50's now.
And it's just too damn loud still. And they're supposed to be quiet according to their scale.
I was looking at mufflers, and there really is t chit out there for a center in, center out, 3' muffler. There's a bunch but they are all a version of glass pack, or some sort of chambered just like what I have.

I like a good loud hotrod. And for the most part in town I love the sound of my truck.
But highway cruising sucks. It's not a droning... It's just fuggin loud.

I have like 3 straight sections all big enough to throw a glass pack in. And I'm half tempted to buy the cheapest ones I can on Amazon or something and try it :dunno:

I was going to try the 70 series BB ones from FM. But I e heard quiet vids and ones where they are loud. So I'm having a hard time trusting I'll like it after a $400 purchase.
 
It's gotten to where we had a day planned to get the truck out on some muddy roads and try the new 40"s last week. But we passed it up because neither of us wanted to listen too it for the 45 min to get to the mud roads. Which means it's time for a change
 
Are you using true duals? I have found that a crossover cuts the snark above 2800 or so making it much smoother

Dynomax super turbo is also a suggestion. Just be aware the inner baffling is smaller than the inlet until you get to 2.5 or 3. I believe flow master is also sized the same

I shy away from everything else with glass in it other than dynomax
 
Bent77 said:
Are you using true duals? I have found that a crossover cuts the snark above 2800 or so making it much smoother

Dynomax super turbo is also a suggestion. Just be aware the inner baffling is smaller than the inlet until you get to 2.5 or 3. I believe flow master is also sized the same

I shy away from everything else with glass in it other than dynomax
Click to expand...
Current setup is 462 feeding long tubes, 3" true duals, no crossover, FM 50 delta flow, angled at a 45, pointed at the ground in front of my rear tires. CCLB

I have the Dynomax super turbos on my burb, with a crossover in it, and that isn't much quieter lol.


Bent77 said:
Or magnaflow. You get what you pay for in the muffler game
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Everything I've seen on magnaflow vids seems loud too. :dunno: Haven't heard much of them in person ever though.

The truck has pretty much no carpet, no pad, no sound deadening, nothing. I think maybe I'll add some deadener mat. And I have some thick rubber to make some floor mats out of. maybe that will help too.
 
shady said:
Current setup is 462 feeding long tubes, 3" true duals, no crossover, FM 50 delta flow, angled at a 45, pointed at the ground in front of my rear tires.
Click to expand...
Of course it's loud - you're dumping it under the truck. Having the exit at the rear bumper quiets it down a lot inside the vehicle. Plus, all else being equal, just having more pipe makes it quieter. I've seen it first hand in different vehicles.

And yes, your theory is true. The "resonator" so common on FWD vehicles is essentially another muffler and makes a huge difference in sound level - especially out on the highway. Likewise, anybody who's done A/B comparison will tell you that with a catalytic converter is quieter than without.
 
Its dumping out the side, on each side. Just past the fender, in front of the wheel. I know taking it back farther would help. But I'd still dump em out the side, just behind the wheel. I can't see that 4' would make a huge difference. Some though yeah.
I already bought some different mufflers just for now. Cheap walker quietones. They're offset input, but I think I can make em work easy enough.

But I think I might try my theory out just for the flock of it some time here lol. And I always kind of thought that about resonators.
started the thread mostly about that, not really about calming my actual truck down lol.
It's what got me thinking about that theory again though.
I came up with that idea not long after getting my first car. Almost 30 years ago. just never thought to try it.
 
Blue85 said:
Of course it's loud - you're dumping it under the truck. Having the exit at the rear bumper quiets it down a lot inside the vehicle. Plus, all else being equal, just having more pipe makes it quieter. I've seen it first hand in different vehicles.
Click to expand...
This factor is HUGE . years ago i added a tail pipe to the muffler to back bumper and it was a whole new truck in the incab sound level .

Turn downs or dead end under the body are for race cars NOT daily driver level stuff .
 
shady said:
I have flow master delta flow 50's now.
And it's just too damn loud still. And they're supposed to be quiet according to their scale.
I was looking at mufflers, and there really is t chit out there for a center in, center out, 3' muffler. There's a bunch but they are all a version of glass pack, or some sort of chambered just like what I have.

I like a good loud hotrod. And for the most part in town I love the sound of my truck.
But highway cruising sucks. It's not a droning... It's just fuggin loud.

I have like 3 straight sections all big enough to throw a glass pack in. And I'm half tempted to buy the cheapest ones I can on Amazon or something and try it :dunno:

I was going to try the 70 series BB ones from FM. But I e heard quiet vids and ones where they are loud. So I'm having a hard time trusting I'll like it after a $400 purchase.
Click to expand...
I just installed dual 2" exhaust with two 50 series Flowmasters, rear exit, and turn down tips on the Impala and it is perfect. Quiet enough for a conversation in the car with a little noise if you get on it.
 
Going behind the tires will be a huge help.
Pop in a h pipe.
And then see how it sounds.
The 3 in pipe isn't helping your case.
If it's to loud after you move the pipes back and add a H pipe I'd add some bullets Over glasspacks in front of you current mufflers.
Of course a glasspack fits the look of your truck better.
Screenshot_20230320_122424_Chrome.jpg


Remember your big block isn't stock. The Flowmaster scale is just rating the muffler.
Once you start building power its hard to tame those horses.
If you put the quiet muffler on a stock 350 engine, it's to be quiet.
But the same muffler on a 462 modified big block isn't going to be at the same decibel level.
 
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