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Magnaflow muffler install

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Old 01-13-2015, 12:37 PM
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Originally Posted by m2cupcar
You might have missed the part about the 12578.
I don't understand. It sounds like Concealer is saying the big Magnaflow (I assume 5x11x22 12578) is not quiet. Did I miss something?
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Old 01-13-2015, 12:41 PM
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For the record, i don't know which Magnaflow is on the Enthuza. It's big, though.

I was just pointing out that David's car is nowhere near as loud as Brain made it out to be. At least... in comparison. He calls me while he's driving it all the time and we can have conversations quite easily.

On the flip side, my Enthuza-equipped car with a big (again, not sure if it's the 12578) Magnaflow muffler doesn't even let me hear my phone ring, and forget about having a conversation if i try to call someone else while driving it.
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Old 01-13-2015, 12:56 PM
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enthuza doesnt use the mt.net approved muffler.
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Old 01-13-2015, 01:03 PM
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magnaflow 12589, the one that shuiend advised me, is really quiet
really, unbelievable. but it's heavy as ****. And big, really big.







Attached Thumbnails Magnaflow muffler install-20141218_180059_zps9140d4bd.jpg   Magnaflow muffler install-20141218_154234_zps46793762.jpg  
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Old 01-13-2015, 01:13 PM
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Originally Posted by Braineack
enthuza doesnt use the mt.net approved muffler.
That makes me feel a bit better

Originally Posted by DNA54
magnaflow 12589, the one that shuiend advised me, is really quiet
really, unbelievable. but it's heavy as ****. And big, really big.
Excellent. This is the same one I'll be using

Edit Derp! I'll be using the 12579, not the 89
Last edited by EO2K; 01-13-2015 at 05:35 PM.
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Old 02-09-2015, 10:07 AM
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Originally Posted by EO2K
I don't understand. It sounds like Concealer is saying the big Magnaflow (I assume 5x11x22 12578) is not quiet. Did I miss something?
afaik- part numbers just differentiate inlet/outlet locations. offset/offset vs. offset/center. Otherwise they are the same straight through design.
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Old 02-09-2015, 10:09 AM
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There's another one that instead of having 1 3" pipe straight through it has 2 2.5" pipes between the two, that one is supposed to be quieter, its like what comes on their non-droning truck exhausts or something like that.
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Old 02-09-2015, 11:56 AM
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Originally Posted by Leafy
There's another one that instead of having 1 3" pipe straight through it has 2 2.5" pipes between the two, that one is supposed to be quieter
That's the one I have and will be using
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Old 02-10-2015, 08:16 AM
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Two tailpipes?
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Old 02-10-2015, 08:18 AM
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Originally Posted by m2cupcar
Two tailpipes?
No, its a 3" in 3" out, but inside the muffler is 2 2.5" perf tubes rather than 1 3".
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Old 02-10-2015, 08:40 AM
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yeah it's designed for huge diesel trucks :P
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Old 02-10-2015, 11:42 AM
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Anybody have the model number for the quieter version?
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Old 02-10-2015, 11:44 AM
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Found this- MF13743- It's not the 22x11x5.... It's a pleasing sausage-y cylinder..

MagnaFlow Stainless Steel, Dual Core, Universal Muffler - XL Turbo Series - Satin Finish MagnaFlow Mufflers MF13743

EDIT: MF13219 has some different dimensions, 4x9x20..
Last edited by Handsome Greg; 02-10-2015 at 11:47 AM. Reason: More discovery. no need for new post
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Old 02-10-2015, 12:00 PM
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Originally Posted by Handsome Greg
Anybody have the model number for the quieter version?
MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles

Originally Posted by Magnaflow 12579
Material: 100% Stainless Steel - Satin Finish
Body Shape: 5in.x11in. Oval
Inlet/Outlet Size: 3in./3in.
Body Length: 22in.
Overall Length: 28in.
Core Size: Dual 2.5in.
Position: Center/Center
Here is the lowdown: https://www.miataturbo.net/diy-turbo...op-muff-67263/

Also, that PN 13743: DO NOT WANT. /shudder
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Old 02-10-2015, 12:06 PM
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Originally Posted by EO2K
MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles



Google that PN here on MT, we have a whole thread about it.

Also, that PN 13743: DO NOT WANT. /shudder
It's industrial and girthy. mmmm..

At a 7" diameter, I wonder if it could be placed in the heatshielded area where the catalytic converter previously resided....
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Old 02-10-2015, 12:09 PM
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DO NOT WANT.
Attached Thumbnails Magnaflow muffler install-mfxldiagram_500.jpg  
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Old 02-10-2015, 12:12 PM
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XL mufflers are "turbo" mufflers. they are chambered. you do not want.

we just put one on y8s civic.
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Old 02-10-2015, 12:34 PM
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Originally Posted by Braineack
I've seen someone do it on an angle and just used a 45° in and out. I could never find the pics again.

otherwise, there's PLENTY of room to mount horizontally.


it's also highly dependent on what i/o's you ended up with. you should not be using a C/C muffler.
I did it way back in 07 or 08. Current muffler is horizontal though.
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Old 02-10-2015, 12:35 PM
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Terrible lighting but you can see it.



Attached Thumbnails Magnaflow muffler install-exhaust7.jpg   Magnaflow muffler install-exhaust6.jpg   Magnaflow muffler install-exhaust5.jpg  
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Old 02-10-2015, 01:33 PM
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Originally Posted by Braineack
XL mufflers are "turbo" mufflers. they are chambered. you do not want.

we just put one on y8s civic.
"Turbo" mufflers are like the "turbo" button on your 386. It makes the system run SLOWER
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