Muffler setup - Vintage Mustang Forums
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post #1 of 13 (permalink) Old 06-25-2019, 06:28 AM Thread Starter
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Muffler setup

What is the consensus on mufflers for a 289 lately?


New Hi-Po exhaust manifolds installed*, 600 cfm Holley, performance cam.


The shop I go to suggested Flowmaster 40 series and I said I want to go quieter than that, so he suggested Cherry Bombs. Am I better off buying my own mufflers? I want to get this right.


Thinking about going without a crossover.


My current setup was installed with headers that I had removed. It looks like the mufflers I'm running are $30 off-the-shelf junk.
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post #2 of 13 (permalink) Old 06-25-2019, 06:50 AM
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What is the consensus on mufflers for a 289 lately?
Consensus? What do you want?

New Hi-Po exhaust manifolds installed*, 600 cfm Holley, performance cam.
Were the heads port-matched to the manifolds? If not, you are losing significant power.


The shop I go to suggested Flowmaster 40 series and I said I want to go quieter than that, so he suggested Cherry Bombs. Am I better off buying my own mufflers? I want to get this right.
Again, what do you want? Sounds like stock or turbo (stock is a form of turbo) mufflers.


Thinking about going without a crossover.
You would be throwing away 15 horsepower.
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post #3 of 13 (permalink) Old 06-25-2019, 08:10 AM
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I had my exhaust done this spring using hipo manifolds, an h pipe, and magnaflow 11224s. I really like the way they sound. Quiet at idle and cruise but they really make some nice sound when the engine is under a load.

Probably the best thing to do is go here https://forums.vintage-mustang.com/m...tups-here.html and to YouTube and listen to sound clips to find the sound you want.


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post #4 of 13 (permalink) Old 06-25-2019, 08:39 AM
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I originally had a set of "turbo" mufflers installed for a couple years, they were cheap and sounded "OK".

I needed a couple bungs installed for an O2 sensor and the shop had some magnaflow knock offs that they claimed sounded just like magnaflow. I had them put them on and I absolutely love how the car sounds now. Mostly quiet at idle/cruise (I have OD), but they sound really good when you get on it.

2011 Mustang 3.7L Premium Pony Package
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1967 Chevrolet C10 350/700R/3.73
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post #5 of 13 (permalink) Old 06-25-2019, 08:43 AM
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I will second the Magnaflow system.

Now if you want to go top dollar, check out original style Mustang Arvinode Exhaust

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post #6 of 13 (permalink) Old 06-25-2019, 08:46 AM
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^That's not too far off how my car sounds with the magnaflow knock offs now (but that does sound even cooler). It sounded more "truck-like" with the "turbos".

2011 Mustang 3.7L Premium Pony Package
2015 Silverado 5.3L 2LT DC Z71
1965 Mustang C Code Coupe 289/T5/3.25
1967 Chevrolet C10 350/700R/3.73
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post #7 of 13 (permalink) Old 06-25-2019, 08:58 AM
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I'm old school, and a 289 Ford doesn't sound right to me unless it's screaming through a set of glasspacks. Save the chambered mufflers for your coyote
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post #8 of 13 (permalink) Old 06-25-2019, 09:15 AM
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Go with a set of turbo style mufflers. Iím running a set of Hedman headers turbo mufflers. Extremely well made and in the USA to boot. No droning and they sound great. Iíve also used the Summit brand of turbo mufflers. Theyíre well made and cheap, Iíd recommend them as well. Donít forget the Walker Dynomax. Theyíre really what I wanted but didnít have the center inlet my exhaust system specified. Actually the offset inlet would have fit better in hindsight.
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post #9 of 13 (permalink) Old 06-25-2019, 11:53 AM
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I won't claim 15 HP on an H or X pipe but it would help scavange and Smooth exhaust pulses
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post #10 of 13 (permalink) Old 06-25-2019, 12:24 PM
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I'm going to step on some toes here, but Flowmasters (and other chambered exhausts) sound like firecrackers in a trashcan. They have an empty, hollow, cheap sound to them, much like the souls of the people who run them. They are perfect for millennials, and people who think that Type-R stickers and coffee can exhaust tips add 50 horsepower.

Cherry bombs (and other straight-through glasspack mufflers) sound amazing, with a beautiful raspy, muscular snarl to them. They may, however, be too much for your ears if you do a lot of highway cruising.

If that's your intent, I would suggest some good 'turbo' mufflers, which are a good compromise of sound quality and quietness, or Magnaflows (which are effectively a glasspack muffler with better sound damping).
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Last edited by Grimbrand; 06-25-2019 at 12:28 PM.
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post #11 of 13 (permalink) Old 06-25-2019, 12:44 PM
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I run dynomax turbo mufflers and like them, but I would try magnaflows if the time came to replace the turbos. This topic is very much personal opinion, and my personal opinion of flowmasters is they make a car sound like a piece of crap.
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post #12 of 13 (permalink) Old 06-25-2019, 01:05 PM
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Prior to removing them for a track exhaust setup, I ran HiPo exhaust manifolds, through a Magnaflow 2 1/4Ē X, and Magnaflow XL-3 mufflers. No drone with a nice mellow rumble at WOT.
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post #13 of 13 (permalink) Old 06-25-2019, 01:19 PM
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I picked up a complete dual exhaust with H-Pipe from CJPP . Wanted to run duals with the new motor rebuild. My 289 has AFR165 heads, Hipo exhaust manifolds and a mild cam. When I fired her up the first time I was pleasantly surprised by the sound. It has a pleasant rumble but is not too loud when you get on it. It was reasonably cheap, fit very well, and sounds pretty good. Wasn't looking for a loud car on this project so I was very happy with the result.
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