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Quiet Muffler Help

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Old Jan 25, 2012 | 12:56 PM
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Default Quiet Muffler Help

Has anyone heard of a muffler with a 4" inlet and outlet that isn't loud as hell. I have a dual 3" inlet to single 4" outlet magnaflow muffler and it is too loud for my taste.

I found an MBRP "Quiet" muffler that is 4" inlet/outlet but I know they make diesel exhaust. Would a diesel muffler be different than a gas muffler? And would it quiet my exhaust down from a magnaflow? Thanks
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Old Jan 26, 2012 | 02:59 AM
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Your dual 3" inlet / single 4" outlet Magnaflow doesn't have a lot of room for sound absorbing packing, that's why it's loud.

Do you have room to add another muffler after your current Magnaflow? Would a 7" dia Magnaflow with a 14", 20", 24" or 30" case length fit?

Last edited by 99Bluz28; Jan 26, 2012 at 12:19 PM.
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Old Jan 26, 2012 | 03:01 AM
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I'd do a 4 inch cutout then neck down an inch into a full case 3 inch muffler like a Magnaflow. Mine is quiet as hell.
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Old Jan 26, 2012 | 11:30 AM
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I would rather not have two mufflers on the truck. But maybe I might have to do that. Even if I do a single 3" inlet and 4" outlet, won't that quiet it down some?
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Old Jan 26, 2012 | 12:24 PM
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Originally Posted by oakley6575
I would rather not have two mufflers on the truck. But maybe I might have to do that. Even if I do a single 3" inlet and 4" outlet, won't that quiet it down some?
Just so I fully understand, you have both the left & right 3" exhaust pipes going into the one, dual 3" inlet/4" outlet muffler; correct?

IMO, don't reduce the outlet size down to a single 3", that'll reduce flow/power.
I'd just replace the muffler with a dual 3" inlet/4" outlet Y-merger. Then run the longest 7" diameter 4" in/out round Magnaflow muffler you can fit .

Last edited by 99Bluz28; Jan 26, 2012 at 12:40 PM.
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Old Jan 26, 2012 | 12:30 PM
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Yes correct. Just like: http://www.summitracing.com/parts/MPE-12198/

Except 3" inlets, and 4" outlet
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Old Jan 26, 2012 | 01:04 PM
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IMO, if you don't want to add another muffler then go with my suggestion above , and use either a Magnaflow #12772 (7" dia 24" case L) or if room permits a #12773 (7"dia. 30" case L)
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Old Jan 26, 2012 | 01:08 PM
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You think it will quiet it down because of the length?
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Old Jan 26, 2012 | 01:18 PM
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Yes, the length for the fact it has more packing inside.
It'll still have a nice Deep rumble.
BTW, I forgot to ask is your exhaust just dumped, or ran out to the side or back?
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Old Jan 26, 2012 | 01:21 PM
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The 4" outlet is dumped after the rear end. I found a 37" walker muffler that is 7" diameter, and 4" in/out. And a 40" walker with a 10" diameter.
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Old Jan 26, 2012 | 02:01 PM
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FYI, if you have the exhaust exit shooting more out to the side than straight down it'll at least cut-down on any drone inside the cab..
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