Suggestions for a "Performance" muffler that isn't too loud

My Newport has these MagnaFlows and is still making way too much noise…
In two weeks I will install other mufflers and will let you know how that turned out

IMG_0093.jpeg
 
Big_John said:
For the 2 1/2" TTI exhaust, yes it is a direct fit.

Turbo on top, Caddy on bottom in this pic.

View attachment 641950

Caddy on left in this pic.

View attachment 641951
Click to expand...
Did your Caddy mufflers neck down to a 1.5" baffle? I was looking at reviews on Summit racing site, and a buyer was not happy with finding that the muffler inlet decreased in size.
A couple of the photos for the part number Walker #21856
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1707005091960.png
www.summitracing.com

Walker Exhaust 21856 Walker Quiet-Flow 3 Mufflers | Summit Racing

Free Shipping - Walker Quiet-Flow 3 Mufflers with qualifying orders of $109. Shop Mufflers at Summit Racing.
www.summitracing.com www.summitracing.com
 
Dobalovr said:
I am looking for suggestions for my 79 300 exhaust system to reduce the sound and vibration my current "Flow Through" system is causing. As many of you know my wife suffers from a debiltating nerve injury to her leg that reacts terribly to loud noises or vibration which has prevented her from going for a ride with me. She can tell when a train is 10 miles away just from the vibrations in our house. I do want something that will sing the song of our people when I step on it but is quiet at idle and under highway cruise. No drone etc. Flowmasters? Magnaflow? What have you used that didn't shake the windows but sounds good under full throttle?
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I have a pair of Walker Quiet Flow stainless steel mufflers on my Fury and have not noticed any drone. My neighbor says the car sounds great. Idle sound is good too. They weren't expensive either.
 
I use the Maremont Turbo the one about 36" long with 3" in and out core is about 30" iF you have the room
otherwise use dual Imperial mufflers
 
Last edited:
You’re welcome
We took out the old mufflers AND took out the cross. Installed the biggest muffler that would fit…. Also installed end mufflers (wanted lowest noise possible).
Thing is though: only when I removed the cross the drone disappeared. This was the last thing I could come up with, to get rid of that drone…. And it worked.

The vibration of both pipes coming together caused this; like a trumpet that only makes a sound when you blow in it correctly.

Hope you know what I mean…
3C's & a D? said:
Thanks for sharing your experience. Just to confirm, as you mentioned getting new mufflers, you removed the x pipe and went "true duals" with the same mufflers and that completely got rid of the drone? Also, are those mini catalytic converters?
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,
 
Newport Woerden said:
You’re welcome
We took out the old mufflers AND took out the cross. Installed the biggest muffler that would fit…. Also installed end mufflers (wanted lowest noise possible).
Click to expand...

Oh btw those little things are not catalic convertors: those are flexible mounting sleeves.
Newport Woerden said:
Thing is though: only when I removed the cross the drone disappeared. This was the last thing I could come up with, to get rid of that drone…. And it worked.

The vibration of both pipes coming together caused this; like a trumpet that only makes a sound when you blow in it correctly.

Hope you know what I mean…

,
Click to expand...
 
Newport Woerden said:
My Newport has these MagnaFlows and is still making way too much noise…
In two weeks I will install other mufflers and will let you know how that turned out

View attachment 641971
Click to expand...
What did you finally get for mufflers? BTW, I'm running Flow master 70s on my 73 Newport. They have good sound and are quiet cruising down the road. Also, no drone.
 
In addition to changing the mufflers, I’d also suggest putting in some type of dynamat- there are lots of options for it now.

I went from 3.5” with 2 chamber Flowmasters and dumps, to a 3” TTI system with tailpipes, Flowmaster 40 series Delta Flows, and added dynamat to the floor when the interior was out. It’s a night and day difference with interior sound level, can actually hear the stereo now and it’s pleasant at cruising speeds.
 
Another option that doesn't require new mufflers is to add resonators (aka glass packs). The longer the better. Most of us have some long sections on either side of the tank before you get to the tips. Read reviews. There is definitely some science behind the frequency of the drone and the length of the resonator needed to break up that tone. Deep drone (what we have mostly) is long wavelength and needs longer resonators to capture that wave and cancel it out. New cars have all kinds of exhaust bulges designed to break up the frequencies specific to that model.

https://www.amazon.com/dp/B0BZY2PDH...otive&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw&th=1
https://www.rockauto.com/en/tools/exhaust+&+emission,resonator,2.5"+inlet+diameter+resonator,1001982
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