Need help with Magnaflow Muffler size and sound
#1686349
10/15/14 11:01 PM
10/15/14 11:01 PM
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Joined: Aug 2013
Posts: 152 usa
smos001
OP
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OP
member
Joined: Aug 2013
Posts: 152
usa
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I am thinking about putting on a set of Magnaflow Mufflers on my 70 Challenger Vert. It has a built 383 with a roller cam, KB pistons etc. 3 inch pipe all the way back and headers with 3 inch collectors. The issue is I want it to sound good, but I need it to be not overly loud. I had flowmaster 40s on before. Way to loud.
It seems Magnaflow come in 14,18,22,and 24 inch sizes?
Anyone have any experience with Magnaflow and the sound level per size? Thanks
Last edited by smos001; 10/15/14 11:11 PM.
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Re: Need help with Magnaflow Muffler size and sound
[Re: smos001]
#1686351
10/16/14 01:38 PM
10/16/14 01:38 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
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Posts: 5,444
Indiana
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I will be swapping out my exhaust this Winter on my Challenger and I am going to use the TTI 2.5" X-pipe assembly (no mufflers) but buying separately the Magnaflow mufflers. I have been bugging the crapt out of the Magnaflow Tech guy asking him questions and trying to determine the same thing as you, how loud will it end up?
Something that might help you is that I asked the rep to tell me which Magnaflow muffler would be louder between this oval and this round style: #11226: 2.5", 4x9x14 oval #12616: 2.5", 6dia x 14 round
His reply: ""They have almost the same internal volume, so they would sound the same."
That to me makes sense. So I am going to start with the 4" x 9" x 14" ovals under the seat with the stock TTi 2.5" exhaust running out the rear. I will start it up and see what it sounds like. My guess is that it will be fairly loud so then I will be looking at adding a pair of the 4" x 14" long round mufflers beside the gas tank to see if that helps out on the noise. After reading some threads of other members, I might need to use two mufflers up front and two out back to keep it where I want it. I think that it will be trial and error.
If you need the Magnaflow Techs email, pm me and I will get that to you.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Need help with Magnaflow Muffler size and sound
[Re: smos001]
#1686353
10/16/14 10:42 PM
10/16/14 10:42 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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The OEM mufflers are horrible for performance as they are a huge restriction (175cfm range). I run the OE mufflers and I can't wait to remove them. Magnaflow mufflers are all straight thru so I don't think that adding more in line with each other would be a restriction issue. But the second one might change the tone.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Need help with Magnaflow Muffler size and sound
[Re: smos001]
#1686356
10/17/14 09:24 AM
10/17/14 09:24 AM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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Indiana
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I am also leaning towards mounting the TTi 2.5" X-pipe assembly (muffler delete pipes) with the aftermarket SS 2.5" tips, and then starting in the back with as big of a round MF muffler that will fit. From the rear of the car, a 6" would fit but since they are Center/Center outlets, the 6" muffler will set down lower and will be seen easier from the rear of the car. A 5" round muffler will fit much better with less muffler being seen from the rear but there is only one selection of 5" (12866 2.5" = 535cfm). If I decide to go this route, I will look at the 5" round x 14" long body beside the gas tank and then see how loud it is with these mufflers. Then if it is too loud, then mount the 4x9x14's under the seat.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Need help with Magnaflow Muffler size and sound
[Re: smos001]
#1686358
10/22/14 09:11 AM
10/22/14 09:11 AM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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How does the sound of the MF 4x9x14's compare to the FM40's?
An H or X pipe should bring down the sound a few decibels.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Need help with Magnaflow Muffler size and sound
[Re: YO7_A66]
#1686359
10/22/14 10:27 AM
10/22/14 10:27 AM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,374
Marion, South Carolina [><]
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An H or X will quieten it down a little. I added an H pipe to my 4" "street" system and it made a noticeable difference. Made it sound better, more "even" sounding if you will. I'm not a fan of X pipes. Don't like the sound at all, but they do make more power than true duals or an H pipe.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Need help with Magnaflow Muffler size and sound
[Re: an8sec70cuda]
#1686360
10/22/14 11:52 AM
10/22/14 11:52 AM
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Joined: Apr 2003
Posts: 348 Texas Hill Country
Centerline
enthusiast
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enthusiast
Joined: Apr 2003
Posts: 348
Texas Hill Country
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Try a couple small resonators near the tips. Worked for the factory on several models.
Last edited by Centerline; 10/22/14 11:53 AM.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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