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Old 05-18-2013, 04:57 PM
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Flowmaster Drone noise and too much noise

Like the title says, I have a dual exhaust from flowmaster. Nice pipes. All mandrel bent. System came with 40 series mufflers.
The noise is really to much for a daily driver. It would be cool at the strip but not so much if you want to turn on the radio.
I am looking for real knowledge suggestions as to which mufflers/brand would be mostly quiet and would not allow the horrid droning to resonate from the exhaust.
Looking for suggestions from those of you who have mild exhaust sound from your mufflers.
I am looking at some magna flow XL series 3 chamber style.

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Old 05-18-2013, 05:22 PM
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I like the Magnaflows...and with an H or X pipe.
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Old 05-18-2013, 05:28 PM
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40 series flowmasters isn't the one you want if you don't want the noise..The Magnaflows are nice..
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Old 05-18-2013, 06:55 PM
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I put 2 1/2" Hushpowers on my ZZ4, with pipes out the back. It gets louder when I have my foot in it, but cruising down the highway it's pretty quiet.
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Old 05-18-2013, 07:57 PM
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Something I did was to install a pair of resonators in the pipes behind the axle and that cut the noise down.

Sam
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Old 05-19-2013, 07:15 AM
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I've got the big block, series 50's on my mildly warmed small block Ford - and they are decently quiet and don't drone. I also have an 'H' pipe which I'm sure also cuts the chances of sharp tones and drones.

http://www.summitracing.com/search/p...-flow-mufflers

Summit's write up for the 40 Series even says they are loud
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Old 05-19-2013, 08:30 AM
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I like the turbo mufflers. They are not expensive and have a nice purr sound.
They probably are a bit more restrictive but I don't need all the power anyway. Driving 100-200 miles with a "droner" will make the day long indeed.
Mine are 4 years old and still in good shape.
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Old 05-19-2013, 10:38 AM
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The system came with the 40 series mufflers and was 360 bucks delivered to my door. Mandrel bends and all the hardware etc. Pretty good price. H crossover too.
At the time money was insanely tight and the car needed something as the neighbor thought the army had some hueys flying over every time I started it
I am looking at the Magnaflow XL 3 series. I was looking around and found a few charts on decibels at idle, 2000 rpm cruise and wot and they seemed the quietest.
I am over all the noise. I want a little sound, but I cant take the droning of the Blowmasters . The 40 series would be fine if the car was at the track mostly, but I am driving it now and want to drive it daily.
It still looks rat roddish but hey....its still kool.
I dont think I will be trying anymore flowmasters, 50 series, deltas or whatever . Time for a complete change.
Thanks to all for your input.
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Old 05-19-2013, 11:07 AM
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The Flowmaster drone issue has been all over the web for over a decade. Even more impressive is how they manage to make that much noise while consistently being among the most restrictive aftermarket mufflers in published tests.

Since I'm now over a certain age (), I prefer Walker Dynomax turbos. Second choice is Magnaflow. A word of caution on the Magnaflows, however. I have one on my 62 F-85 and initially it was too loud for my tastes and sounded somewhat agricultural in the midrange. After about 5,000 miles, the muffler has quieted down significantly (either that, or my hearing is getting worse). I attribute this to the fiberglass packing in the muffler becoming coated with carbon from the exhaust. Carbon black is an excellent absorber of light and sound.
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Old 05-19-2013, 02:27 PM
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Quote:
Originally Posted by LATECH View Post
Like the title says, I have a dual exhaust from flowmaster. Nice pipes. All mandrel bent. System came with 40 series mufflers.
The noise is really to much for a daily driver. It would be cool at the strip but not so much if you want to turn on the radio.
I am looking for real knowledge suggestions as to which mufflers/brand would be mostly quiet and would not allow the horrid droning to resonate from the exhaust.
Looking for suggestions from those of you who have mild exhaust sound from your mufflers.
I am looking at some magna flow XL series 3 chamber style.
I had Flowmaster 40's on my 73 Mustang with a warmed over 460. My wife and kids didn't like riding in the car because the drone would make your ears hurt. Switched to Dynomax super turbo's and the car is much more pleasant to drive while still sounding like a muscle car..
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Old 05-19-2013, 02:56 PM
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I just ordered a pair of Magnaflow XL 3 mufflers.
I like the dynomax turbos (or at least it sounds like I would) but I couldnt find a size that was correct enough to install. Remember this system is allready in use. The Magnaflow has an XL 3 with the correct dimensions for my system so I went with them.
I hope they dont sound like a farm Implement.... (thanks Joe)
I want to thank everyone for contributing. Your help is appreciated.
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Old 05-19-2013, 07:36 PM
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There's a GM muffler that out performs all the noisy ones, But only one problem with it.
It's quiet. IIRC it came out on the Cadillac Eldoo, or coupe DeVille. 'Round the early '70s or late '60s.
I can get exact part number, (probably been superceeded by now) inna day or so.
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Old 05-20-2013, 01:21 AM
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I personally like the Dynomax Ultraflow mufflers or the Borla (not the chambered ones) chambered mufflers have a high chance of drone. Go on youtube and do a search, you will find hundreds and hundreds of sound clips. Most have fairly detailed descriptions.

Another one I really like that not many people know about is the Hooker Aero Chamber mufflers, kind of a cross between a glass back and a chambered muffler.
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Old 05-20-2013, 09:42 AM
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what causes the drone??
if it's the harmonics of the flowmaster 40's case, would welding on say rebar to the case change it enough to stop it..
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Old 05-20-2013, 10:04 AM
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Quote:
Originally Posted by gearheadslife View Post
what causes the drone??
if it's the harmonics of the flowmaster 40's case, would welding on say rebar to the case change it enough to stop it..
Yeah, IF you knew what the cause was... (as opposed to internal harmonics due to the inherent design.)

Of course, rather than paying for mufflers that are overly restrictive and then having to spend time doing trial and error mods, you could just buy mufflers that are less restrictive and don't drone to start with.

Just sayin'
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