New dynomax muffler any good?'
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Old December 24th, 2012, 05:42 PM   #1
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New dynomax muffler any good?'


https://www.youtube.com/watch?v=dpeO5V762Rw


I'm looking for a high flow muffler with little to no drone. Up until recently this was a contradiction in terms. But you have flowmaster making the hushpower, and now this. But it looks... I don't know... like a gimmick. A freaking spring is the only way it operates. It just gets louder as you reach more RPM's. Hmm. That would indicate that its still going to have at least some drone at cruising speeds of 65 and 75mph. It would have to. That drone might be somewhat quieter than your standard drone, but it would still be there.

Thoughts?
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Old December 24th, 2012, 06:01 PM   #2
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I've heard very mixed reviews on them, but I've never actually heard one before. What I've read on several forums is that they have a decent Dynomax sound, but the trap door that's in them is prone to spring failure. I've also heard that at idle, and cruising throttle, there's just enough exhaust pressure to open the door, but not enough to keep it open, so the door basically "flaps," and since it closes metal on metal, it constantly makes a clanking sound.
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Old December 24th, 2012, 06:43 PM   #3
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I want to put one on my truck but I haven't because of that very thing. You should buy some and report back with your findings....lol
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Old December 24th, 2012, 06:50 PM   #4
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lol I'm the guy that usually lets everyone else guinea pig everything first.

But I might just go with some hushpowers instead. IF i can still come up with some way for it to be loud at times. Like some of those modern electric exhaust pipe valves. I remember the sucky old cable ones that you had to pull a cable to get that valve to open. I like the electric versions now.

Just run some hushpowers and don't open that valve unless you want it to be loud for a minute.
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Old December 24th, 2012, 07:35 PM   #5
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Just my $0.02.
I have Dynomax ultraflos, http://www.dynomax.com/mufflers.php?...ultraflowelded. They are straight through perforated tube with very little restriction and there is very little drone compared to the regular flowmasters. Acceptable drone may be different for each of us. On this specific car, the flowmasters were unbearable. I did not get the ones with the valve for the reasons stated above.

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Old December 24th, 2012, 07:40 PM   #6
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10 bucks says that spring rusts away and fails
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Old December 24th, 2012, 08:22 PM   #7
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Originally Posted by mab View Post
10 bucks says that spring rusts away and fails
Within 1 winter in the northern states.
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Old December 24th, 2012, 10:14 PM   #8
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I recently took off my Flomaster 3 chambers in favor of some Hooker Maximum Flow's, which is the same principal as a Dyno Max Ultra Flow or Magnaflow, Straight thru oval type muffler. My crusing drone is way, way better than the Flowmasters, & is alot quiter all around. I like them much better than the Flow's!
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Old December 25th, 2012, 01:55 PM   #9
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Originally Posted by mab View Post
10 bucks says that spring rusts away and fails
Kinda what I was thinking.

Originally Posted by horsepowerjunkie View Post
I recently took off my Flomaster 3 chambers in favor of some Hooker Maximum Flow's, which is the same principal as a Dyno Max Ultra Flow or Magnaflow, Straight thru oval type muffler. My crusing drone is way, way better than the Flowmasters, & is alot quiter all around. I like them much better than the Flow's!
Are they still a little loud when you want them to be? Or is it just a quiet, high flow muffler? Unlike factory which would of course be a quiet, restrictive muffler.
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Old December 25th, 2012, 02:08 PM   #10
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When you step on it, there is quite a bark!
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Old December 25th, 2012, 03:10 PM   #11
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there is a scientific way to getting rid of drone. i posted a thread about it, let me look for it
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Old December 25th, 2012, 03:13 PM   #12
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Exhaust Drone is Completely Gone - Ford Mustang Forums : Corral.net Mustang Forum

if you dont feel like reading it cuz its rather long, it involves welding two capped resonators on each bank. they have to be a specific length so the sound waves bounce back 180 degrees out and cancel the drone
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Old December 25th, 2012, 09:50 PM   #13
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Originally Posted by mab View Post
Exhaust Drone is Completely Gone - Ford Mustang Forums : Corral.net Mustang Forum

if you dont feel like reading it cuz its rather long, it involves welding two capped resonators on each bank. they have to be a specific length so the sound waves bounce back 180 degrees out and cancel the drone
Ohh nice I'll dive off into that a little later. You know another thing I've always hated? That popping sound some cars make when they let off the gas. When they have a loud exhaust. Sounds cheap and poorly made to me. I find it to be lower class than exhaust that doesn't do it. It sounds like your method would also cure that as well.
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Old December 25th, 2012, 10:27 PM   #14
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Originally Posted by Dr.Scientist View Post
Ohh nice I'll dive off into that a little later. You know another thing I've always hated? That popping sound some cars make when they let off the gas. When they have a loud exhaust. Sounds cheap and poorly made to me. I find it to be lower class than exhaust that doesn't do it. It sounds like your method would also cure that as well.
Thats because of reduced/no back pressure isnt it?
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Old December 26th, 2012, 03:33 PM   #15
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Originally Posted by 93Mustang5.0 View Post
Thats because of reduced/no back pressure isnt it?
Bingo!
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Old December 26th, 2012, 05:36 PM   #16
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My buddys truck crackels and pops. I acctually dont mind it
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Originally Posted by Towelie View Post
I'm not proud of the things I did for a klondike bar
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Old December 27th, 2012, 09:39 AM   #17
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I think that he's suffering some power loss due to the reduced back pressure. I heard that you do need the back pressure, but I can't remember how much.
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Old December 27th, 2012, 09:40 AM   #18
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Magna packs ftw!

... Sent from your car :
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Old December 27th, 2012, 09:52 AM   #19
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Originally Posted by Dr.Scientist View Post
I think that he's suffering some power loss due to the reduced back pressure. I heard that you do need the back pressure, but I can't remember how much.
That's a myth. Backpressure is a restriction. What you want is scavaging.
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Old December 28th, 2012, 09:52 PM   #20
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You like small block fords better than LSX? LSX seems to be what everyone wants these days.

But I always thought that if you bought awesome heads for a 393 or a 347 they'd be about the same.
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