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Old 10-21-2019, 06:51 AM   #16
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Default Re: Quieter 4 inch muffler

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Originally Posted by dfarr67 View Post
Whats the scoop on these multi cores- Borla is expensive but these are crazy....but I'll pay if they work well. Next to no reviews.

Borla 400069 XR-1 Multi-Core 4" Center-Center 23"x5.5"x8.5"
The body of the muffler is too small imo, to do any serious sound reduction. I certainly wouldn't want to pop for that kind of money "just to see".
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Old 10-21-2019, 11:01 AM   #17
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Default Re: Quieter 4 inch muffler

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no such thing!
this^^^^^^^^^^^^^^
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Old 10-21-2019, 11:38 AM   #18
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Default Re: Quieter 4 inch muffler

Edelbrock use to make their RPM series mufflers. Had something called a 'tru flow' core. I know they made them in at least 3.5"... as a buddy bought some. Fairly large case, and probably what you would want... but, I think they went out of production 10-12 years ago. Borla might be your best bet, if they make one long/large enough to absorb a decent amount of sound. Either this, or if you have room... start looking into 4" diesel stuff. It's a very popular size in those trucks. Good chance of finding what you are looking for.
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Old 10-21-2019, 11:42 AM   #19
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Default Re: Quieter 4 inch muffler

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Originally Posted by mufflerguy View Post
The body of the muffler is too small imo, to do any serious sound reduction. I certainly wouldn't want to pop for that kind of money "just to see".
Exactly.

Well, coming down to two choices- ganging up two Aerochamber 3.5in with bullet and I'm going to phone Donaldson about their 34-44in 4in muffler with the mid tier chamber design in mind they do list dB unsure what range non diesel would be.
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Old 10-21-2019, 11:46 AM   #20
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Default Re: Quieter 4 inch muffler

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Edelbrock use to make their RPM series mufflers. Had something called a 'tru flow' core. I know they made them in at least 3.5"... as a buddy bought some. Fairly large case, and probably what you would want... but, I think they went out of production 10-12 years ago. Borla might be your best bet, if they make one long/large enough to absorb a decent amount of sound. Either this, or if you have room... start looking into 4" diesel stuff. It's a very popular size in those trucks. Good chance of finding what you are looking for.
I have the old Eddy TES headers- they were expensive at the time but have lasted well, they had decent shocks and exhaust- but all gone now or at least sold off.
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Old 10-21-2019, 11:47 AM   #21
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Default Re: Quieter 4 inch muffler

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Originally Posted by classracer View Post
no such thing!
I know- trying to the best I can other than building a custom muffler as in ST.
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Old 10-21-2019, 12:17 PM   #22
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Default Re: Quieter 4 inch muffler

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Originally Posted by n2omike View Post
Edelbrock use to make their RPM series mufflers. Had something called a 'tru flow' core. I know they made them in at least 3.5"... as a buddy bought some. Fairly large case, and probably what you would want... but, I think they went out of production 10-12 years ago. Borla might be your best bet, if they make one long/large enough to absorb a decent amount of sound. Either this, or if you have room... start looking into 4" diesel stuff. It's a very popular size in those trucks. Good chance of finding what you are looking for.
The DIESEL comment was well down in my post, but that is likely your best bet for a semi-quiet 4" muffler. 4" is a very popular size with the diesel crowd. Should be some decent mufflers available. Just double check their dimensions.

Good Luck
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Old 10-21-2019, 03:19 PM   #23
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Weren't the borla xr1 tried on a fast door car or something like that. Thought I Saw a video of them testing the weekend before a big race where sound restrictions were discussed. If its them supposedly they did well.
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Old 10-21-2019, 03:53 PM   #24
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Default Re: Quieter 4 inch muffler

Fundamentally, a diesel muffler works on different inputs than an automotive muffler.
A diesel runs at 1500-1800RPM down the road where a V-8 gasser runs higher RPM.
The noise frequency a diesel muffler is around 75-90Hz for a straight 6 diesel where a V-8 gasser is around 133Hz at 2000RPM.
You can certainly bolt one or two diesel mufflers on and it will attenuate some frequencies, just not the best job for the ones that a V8 makes at most driving conditions.
Donaldson does make good quality diesel mufflers...
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Old 10-22-2019, 07:17 AM   #25
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Default Re: Quieter 4 inch muffler

Blackwidow muffler---Widowmaker 10
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Old 10-24-2019, 08:08 PM   #26
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Quote:
Originally Posted by SBP436 View Post
USE A 4X3 REDUCER AT THE MUFFLER AND USE A 3"PYPES RACEFLOW MUFF,JUST AN IDEA.
i have 3" m80 pypes..not bad but no different then a long bullet muffler..they basically just take some of the crackle off but not much..to get threw inspection i run the m80s then into case style ultraflos..
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Old 10-25-2019, 06:54 PM   #27
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Default Re: Quieter 4 inch muffler

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Originally Posted by Rick! View Post
Fundamentally, a diesel muffler works on different inputs than an automotive muffler.
A diesel runs at 1500-1800RPM down the road where a V-8 gasser runs higher RPM.
The noise frequency a diesel muffler is around 75-90Hz for a straight 6 diesel where a V-8 gasser is around 133Hz at 2000RPM.
You can certainly bolt one or two diesel mufflers on and it will attenuate some frequencies, just not the best job for the ones that a V8 makes at most driving conditions.
Donaldson does make good quality diesel mufflers...

This is where I wanted to go with the dB differences behind Donaldson models- maybe a quality muffler, but not designed for my application.

http://garage.grumpysperformance.com...82/#post-94525

Maybe it time to test some augers.
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Old 10-25-2019, 09:12 PM   #28
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Default Re: Quieter 4 inch muffler

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Originally Posted by dfarr67 View Post
This is where I wanted to go with the dB differences behind Donaldson models- maybe a quality muffler, but not designed for my application.

http://garage.grumpysperformance.com...82/#post-94525

Maybe it time to test some augers.
Augers are HORRIBLE. They absolutely destroy flow. I'd try a diesel muffler first. At least those are made to flow a LOT of air! As you know, diesels have no throttle butterfly. They run WIDE OPEN all the time, and only use fuel for the throttle. It's why diesel exhausts are so big. They run wide open WITH a big turbo blowing through them... and it all goes through a single exhaust pipe.

A 4" diesel muffler will flow a LOT better than a damn auger. Plus, the auger doesn't do hardly shit for muffling. It's just a baffle that clogs up the exhaust... and muffles that way.
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Old 10-28-2019, 09:57 AM   #29
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Default Re: Quieter 4 inch muffler

auggers suck at db canceling an then kill power..


you could do 2 round ultra flows back to back.
heres my cam only ls1 with 3" ultra flows dumped under axle
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Old 10-28-2019, 01:08 PM   #30
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Default Re: Quieter 4 inch muffler

OK, I misunderstood the dB thing, as I read through the Donaldson muffler spec- it means the amount of engine exhaust noise that is reduced- I was thinking a tuning thing, So with the minimum cfm passed being 1543- it looks like any of the 4 inch inline mufflers would work. Will have to look at pricing vs cfm as some of these are quite $$.
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