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Magnaflow mufflers comparisons?

Winchested

Winchested

IH Scout SSII
Joined
Jun 19, 2020
Member Number
2128
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1,404
Anyone have any experience with Magnaflow 18" body vrs 24" body as far as overall noise reduction?

Stupidly I couldn't find the 24" bodied one on the magnaflow website, their search is stupid.

I only found the 14 or 18" version. So bought the 18" and it's stupid loud.

Their tech line informed me of the 24" version.

Will the extra 6" of body help cut the noise by 35-40%?

I might have room to run a 3" bullet resonator before the tailpipe tip after the muffler too.

Or do I just throw the power robbing walker quiet flow back in? It's a 6x9" bodyx 24" but the 2.5 inch inlets neck down to 1.75" inside the muffler... This big boy was original spec on late model gm/Chevy 6.0 engine on the 2500 HD. Walker 21533

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I don't really have room to add resonators pre muffler, my 2.5 tubes only have 1" between them.
 
The problem is my configuration.

Only a couple manufactures make

Bi--directional dual 2.5" in, 3" out.

I just took my lazy ass out there and measured. I can fit 4" diameter bullet resonators pre muffler so I'm ordering a couple before I drop the $270 on the 24" magnaflow.

The resonators might have 1/16" of clearance between the other pipe but should fit I just have to stagger them 16 inches.
 
I had dual flowmaster delta 50s on this way beck when I had the IH 345 in it. They had way too much friggen drone, I ended up with a crossover and dual 12" resonators on that (2.25") becuase it was annoying to be in all day crawling.

I don't know how guys drive their trail buggies all day with shitty loud exhausts. It just makes my brain hurt and tired thinking about it.

This scout was stupid loud with this 18" magnaflow, we had to wear earplugs the whole trip to Tennessee and back.
 
Tydes said:
check these guys out, they have all sort of packaging option and you can choose how loud you want them.

SpinTech High Performance Mufflers and Exhaust Products

Spintech Mufflers, High Performance Exhaust, Spintech Street and Race Mufflers, Performance Exhaust, Oval Exhaust, Low Profile Mufflers
spintechmufflers.com spintechmufflers.com
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I did see those advertised in summit racing but what I'd need to order isn't an off the shelf model. And in stainless it would be $$$$ shipped to Canada. $337 US before shipping for the sport 5000 model in stainless. That's like prob close to $600 by the time I get it to Canada and pay insane duty on it.

They look awesome though it's a 8.5"x 4" x 22 case.

The big block version is 10.5"x4"x 20" case but it's too wide for the spot I have.
 
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So first step. Is installing these jungle store 2.5" resonators.

The actual resonated section is about 10".
They actually look like nice quality for what they are.

I have to stagger them as them pipes are only. 1" apart going into the muffler.

All these muffler manufactures suck and none do any actually decibel testing on an average engine for a baseline number. At least that was Magnaflows response. They say the #12388 is the biggest muffler they make. And will be the quietest.

(well actually spintech does offer some decibel Numbers)

Flow master has their color arrow loudness graphic.

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pinchegringo has the quietest exhaust I have ever heard on his LS powered crawler. Whatever he did to make it that quiet works better than any stack of resonators and mufflers I've ever heard, it's almost comically quiet. Last weekend at the U4 nationals 665.0coupe and myself were in my KRX trail riding with Pinchegringo in his crawler and the few times we got ahead of him on the trail and stopped the only way we could tell he was still coming up behind us was to shut off my KRX and wait to hear the sound of twigs snapping and leaves crunching. :smokin:
 
SLOWPOKE693 said:
pinchegringo has the quietest exhaust I have ever heard on his LS powered crawler. Whatever he did to make it that quiet works better than any stack of resonators and mufflers I've ever heard, it's almost comically quiet. Last weekend at the U4 nationals 665.0coupe and myself were in my KRX trail riding with Pinchegringo in his crawler and the few times we got ahead of him on the trail and stopped the only way we could tell he was still coming up behind us was to shut off my KRX and wait to hear the sound of twigs snapping and leaves crunching. :smokin:
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That's interesting! pinchegringo what muffler you running. And exhaust tubing size combo?
 
Winchested said:
That's interesting! pinchegringo what muffler you running. And exhaust tubing size combo?
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I believe he is out wheeling for the weekend in a place that probably has no service so don't be offended if you dont hear from him before Monday. He told me his recipe but I don't 100% remember. I do know its manifolds that go 2 into 1 with a single tail pipe and a Flowmaster muffler that isn't one of their quiet (Hushpower) series. He does something with the pipe sizing before the muffler to make it quiet but I'll let him explain so I don't fuck it up.
 
Getting the tail pipe to the back helps a lot with in cab sound. My old xj buggy had a glass pack that dumped down before the axle and had a horrible drone. Scabbed in tail pipe all the way to the back that took all the drone away. Still sounded like crap but not much you can do with a jeep 4.o to sound good.
 
SMI17 said:
Getting the tail pipe to the back helps a lot with in cab sound. My old xj buggy had a glass pack that dumped down before the axle and had a horrible drone. Scabbed in tail pipe all the way to the back that took all the drone away. Still sounded like crap but not much you can do with a jeep 4.o to sound good.
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Tail pipe is out the rear driver side behind the rear tire.
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bdkw1 said:
That looks a lot like the old Edelbrock RPM mufflers. They were a split core glass pack and sounded awesome. My all time favorite muffler.

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I like the fact that the picture is on paper, shows how old it and I am.
I wouldn't hesitate to run that if it would fit.
The linear flow design is probably the best dampening per cubic inch or muffler.
 
The problem with a glass pack is that every decibel you remove comes at a backpressure penalty. The race mufflers just drill small holes in the inner pipe and don't really direct any sound into the mat. A traditional glass pack will have scoops directing flow into the mat and totally disturbing the flow. A chamber muffler creates some pressure directing exhaust into different chambers but much less than a useable glass. I toyed with a glass chamber muffler years ago but got sidetracked.
The point at which your right bank pulse meets your left bank pulse also plays a role.
It will either bunch up or get in line for the exit. Takes a decibel meter and some time to tune that out in a collector.
The speed of the air in your header/downpipe also has a lot to do with noise level. A larger slower downpipe will be much quieter if it reduces size toward the finish line. So a 3 inch downpipe to a 2.5 tailpipe will drone/pop less than a 2 head to 2.5 tail.
Most of your backpressure relief also comes from the header/collector where pulses are strong and not so much from the tailpipe.
Mostly sorta, it's super complicated more so than people realize.
 
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Well ended up putting the two resonators in and then put the old muffler back on. (GM 3500 HD 6.0 muffler Walker quiet flow)

Its back to quiet and the resonators seem to have taken the down shift popping out of equation.

I'm back to happy, the loudest thing at. 60 mph is the tires.

Also got rid of the side exit and put the dump right before the bumper, keep it out of the rocks.
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I run the 18” mpe-12649 on my LQ4 with heads and cam in my buggy.

I feel like it’s been getting louder over time as I’m guessing the packing is burning off. It’s 3 years old and I still pass sound test at local park, but I sometimes wish it had a bit more sound dampening at idle, but I do like the noises it makes when I’m getting after it.
 
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JohnnyJ said:
I run the 18” mpe-12649 on my LQ4 with heads and cam in my buggy.

I feel like it’s been getting louder over time as I’m guessing the packing is burning off. It’s 3 years old and I still pass sound test at local park, but I sometimes wish it had a bit more sound dampening at idle, but I do like the noises it makes when I’m getting after it.
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I must be getting old (almoat 38) my brain can't handle that loud all day wheeling get a big headache and it's annoying as fuck.

In a soft top scout II with no carpet and sound deadening it's just way to much. More so the drone. I wouldn't have thought a straight through would have the drone I experienced previously with magnaflows.

Maybe one day when I kill the Walker 21533 Quiet-Flow SS I might try the 24" magnaflow.
 
Winchested said:
I must be getting old (almoat 38) my brain can't handle that loud all day wheeling get a big headache and it's annoying as fuck.

In a soft top scout II with no carpet and sound deadening it's just way to much. More so the drone. I wouldn't have thought a straight through would have the drone I experienced previously with magnaflows.

Maybe one day when I kill the Walker 21533 Quiet-Flow SS I might try the 24" magnaflow.
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I'm older and in an open buggy. The sound isn't so bad to give me headaches, and I have no issue keeping a conversation going when I do have a passenger, but I have thought about adding in a resonator to see how it impacts the sound.
 
pinchegringo said:
Mostly sorta, it's super complicated more so than people realize.
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We discussed intake/exhaust tuning a little in University, and that was about the gist of it. I always wanted to learn more, but I don't really have a use for the info.
 
pinchegringo said:
The problem with a glass pack is that every decibel you remove comes at a backpressure penalty. The race mufflers just drill small holes in the inner pipe and don't really direct any sound into the mat. A traditional glass pack will have scoops directing flow into the mat and totally disturbing the flow. A chamber muffler creates some pressure directing exhaust into different chambers but much less than a useable glass. I toyed with a glass chamber muffler years ago but got sidetracked.
The point at which your right bank pulse meets your left bank pulse also plays a role.
It will either bunch up or get in line for the exit. Takes a decibel meter and some time to tune that out in a collector.
The speed of the air in your header/downpipe also has a lot to do with noise level. A larger slower downpipe will be much quieter if it reduces size toward the finish line. So a 3 inch downpipe to a 2.5 tailpipe will drone/pop less than a 2 head to 2.5 tail.
Most of your backpressure relief also comes from the header/collector where pulses are strong and not so much from the tailpipe.
Mostly sorta, it's super complicated more so than people realize.
Click to expand...

So you're trimming the collector length for sound, the same as they do to get that last HP out of an engine?

The last part makes me nervous.:flipoff2: Where do headers fit into what you're referring to as a down pipe? I made a set of tri-Y headers that get larger on their way to the collector. So 1.875" to 2.125" to 3" at the collector. Resonator ~6" behind the collector and muffler ~10" behind that.
 
gt1guy said:
So you're trimming the collector length for sound, the same as they do to get that last HP out of an engine?

The last part makes me nervous.:flipoff2: Where do headers fit into what you're referring to as a down pipe? I made a set of tri-Y headers that get larger on their way to the collector. So 1.875" to 2.125" to 3" at the collector. Resonator ~6" behind the collector and muffler ~10" behind that.
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Trimming where the y pipe meets on single exhaust so the pulses stay separated. You can also calm some dual pulses with a H or X pipe. Yours should sound fine, I was more referring to tailpipes large and long enough to act like echo chambers. You remember the megaphone truck tips in the 90's?
 
I have a universal round "AP/Eastern enforcer II" from rockauto and it's super quiet. It's on a Toyota 3.4 V6.
 
pinchegringo said:
Trimming where the y pipe meets on single exhaust so the pulses stay separated. You can also calm some dual pulses with a H or X pipe. Yours should sound fine, I was more referring to tailpipes large and long enough to act like echo chambers. You remember the megaphone truck tips in the 90's?
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Ok, that makes sense. Very smart. Now I understand why you said you use a decibel meter.
 
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