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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 11-10-2014, 12:54 AM
fbnewell fbnewell is offline
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Default Performance muffler length vs sound

Want to install a performance, straight-through muffler (probably a Dynomax UltraFlo), but not be terribly loud. Question is - will a longer muffler be quieter than a shorter one? Looking at some UltraFlo models, all 3" in/out, 4.5"x9.75" body with offset/center configuration. Have 3 different body lengths available - 24" (29" overall), 20" (25"), and 14" (19"). Am I correct in assuming the longer the muffler, the quieter? In this case, would it be a noticeable difference? Any gains to be had by replacing stock with one of these AND leaving the resonator on it, i.e. replacing ONLY the muffler?

Outdoorsman, single, side exhaust outlet.
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Last edited by fbnewell; 11-10-2014 at 12:56 AM.
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Old 11-11-2014, 12:25 PM
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Try to find someone with the set up to listen to. I had a Borla system that sounded great. It got damaged and my mechanic made me a cheap system using a "Thrush" muffler. Now it sounds like crap. I guess the sound quality has a lot to do with the cost of the system.
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Old 11-11-2014, 01:19 PM
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Leave the stock one on if you want quiet. As for performance, length doesn't matter so much, what's inside does. A straight through is going to be the best. Magna flow's 22" is quiet and flows well, as does the 18", both are reasonably quiet, but a little louder than stock.
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Old 11-14-2014, 11:43 AM
fbnewell fbnewell is offline
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Went ahead and ordered a DynoMax UltraFlo cat-back kit for it. Figure that, since it all just bolts on, if I don't like it, I can always go back to stock. This kit has a 20" body muffler. Have run UltraFlow mufflers on a '87 Monte Carlo SS w/ Summit 383 Stroker, '70 Buick GSX w/ Stage 1 455, and '71 Challenger w/ 426 HEMI. All sounded totally different, but very good! We'll see.
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Old 11-14-2014, 02:47 PM
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You are correct in your assumption about the length and how it affects the sound. With the design and other dimensions of the muffler body remaining the same and only length changing, a longer muffler will be quieter than a shorter one. The Dynomax series is similar to the Magnaflow series. Both are straight through designs and the Magnaflow is offered in 14", 18", and 22" depending on how loud (or quiet) you want it. I doubt you are going to see any noticeable power gains from either or any kind of catback for that matter and I don't think leaving or removing the resonators is going to affect anything other than the sound of the exhaust.

Hope this helps some.
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Old 11-14-2014, 05:49 PM
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Thanx for the info,starquestbd22.
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