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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 11-17-2013, 08:35 PM
ArcticWhite ArcticWhite is offline
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Default Review: Mufflex Drone Supression Pipe

I just put one of these on my 2012 Ram Sport and thought I'd provide a review and a couple pictures, so people can see what they are like installed and my opinion of it.

I am actually suprpised there is very little information on these in the forum. My truck has the mufflex 18" system on it. I loved the sound, had no problems with it in the city, but the drone on the highway really bothered me. I do a bit of long distance towing. The truck under load at anything under 1900rpm was annoying. I am used to Corsa exhausts that can be very loud, but have NO drone. That is not the case with Mufflex.

My first impression is: this is how all mufflex systems should come. They should find a way to add this type of tuned pipe inside the muffler. Initial startup after the install was night and day. The truck is so much quieter inside. Still all the volume out the back. Idle and driving around town is almost like having a stock exhaust back on the truck (at least until you get on the go pedal hard). I'm loving it.

It does not completely eliminate drone. I still get noticeable drone from around 1600rpm to 1800rpm on the highway. However, it is much less than before. And everything outside that range is now almost stock-like quiet, unless you kick it down. When you do that, it is not drone you hear, it is the exhaust noise from the back of the truck.

The worst drone you can get (lugging the truck in gear just up to the point of kick down) is about the same volume as it used to be in this range when the truck was just cruising and not under load.

To sum it up: Much quieter in the cabin at idle and driving around town. On the highway, it does not completely eliminate drone, but does quite noticeably suppress the drone. I should have taken dB readings before and after. Sorry I did not think of it. Anyone sensitive to drone, but still wanting a louder exhaust, should definitely get the drone suppression pipe with a mufflex system. In fact, with the drone suppression pipe, I would now be willing to buy the 14" muffler.

I feel it is well worth the money, as I was prepared to pull the mufflex system off and put something else on. This now hits the sweet spot between an exhaust with a performance sound I can hear and acceptable drone without having to buy a different system.

Here are a couple installed pics:



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  #2  
Old 11-18-2013, 10:41 PM
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It is acting like a resonance chamber in a muffler. Part of the sound wave goes into this 90 hole and cancels itself out by its own vibrations. Most stock type mufflers have this feature, but straight though mufflers don't. You can make your own with a T joint & 90 bend on the end. With a cap welded on one end, the length of the pipe off the 90 bend can be tuned longer or shorter to fit your engine/exhaust drone point. You can have two on the same pipe if needed.
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Last edited by oldhp; 11-18-2013 at 10:44 PM.
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Old 11-24-2013, 07:47 PM
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Thanks for the review on this. I have the DODM80 and I might go back to the Maggy 14" because of the drone on the highway. I was hoping that this would work with a straight pipe but I can't confirm if it will.
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Old 12-18-2013, 10:47 AM
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The Mufflex website says it won't work with the 80. I wonder why. It seems like the ideal setup for loud exhaust without the drone.
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Old 12-20-2013, 07:41 AM
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I talked to the guys at Mufflex and they said it will suppres some of the drone when running a DODM80 but not all. If it can cut it in half, I will be happy. Hey Artic, any tips for the install? I see that yours is further away from the muffler than I've seen others put it.
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Old 12-24-2013, 05:00 PM
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Yeah, like Oldhp says. This is basically a side branch resonator, 1/4 wave resonator, or Hemholtz chamber. It splits some of the exhaust gasses off into this 90deg pipe that is capped at the end and basically takes a 1/4 wave and turns it 180deg back on itself. Results vary by length of this tube. Tube diameter will only affect attenuation. Generally the same diameter as the rest of the exhaust or slightly less is acceptable. There is a specific calculation involving the speed of sound, wave length, exhaust pipe length etc (Not getting into it here but Google is your friend) to figure out how long to make the tube. If the calculation is too difficult, you can simply start with something like a 32" tube and see what that does. If it doesn't eliminate the drone, you can start cutting an inch or two off until you get to the magic length.
There are issues with the idea. Like soot buildup as well as corrosion over time.
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Old 12-26-2013, 09:19 AM
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Quote:
Originally Posted by ArcticWhite View Post
I just put one of these on my 2012 Ram Sport and thought I'd provide a review and a couple pictures, so people can see what they are like installed and my opinion of it.

I am actually suprpised there is very little information on these in the forum. My truck has the mufflex 18" system on it. I loved the sound, had no problems with it in the city, but the drone on the highway really bothered me. I do a bit of long distance towing. The truck under load at anything under 1900rpm was annoying. I am used to Corsa exhausts that can be very loud, but have NO drone. That is not the case with Mufflex.

My first impression is: this is how all mufflex systems should come. They should find a way to add this type of tuned pipe inside the muffler. Initial startup after the install was night and day. The truck is so much quieter inside. Still all the volume out the back. Idle and driving around town is almost like having a stock exhaust back on the truck (at least until you get on the go pedal hard). I'm loving it.

It does not completely eliminate drone. I still get noticeable drone from around 1600rpm to 1800rpm on the highway. However, it is much less than before. And everything outside that range is now almost stock-like quiet, unless you kick it down. When you do that, it is not drone you hear, it is the exhaust noise from the back of the truck.

The worst drone you can get (lugging the truck in gear just up to the point of kick down) is about the same volume as it used to be in this range when the truck was just cruising and not under load.

To sum it up: Much quieter in the cabin at idle and driving around town. On the highway, it does not completely eliminate drone, but does quite noticeably suppress the drone. I should have taken dB readings before and after. Sorry I did not think of it. Anyone sensitive to drone, but still wanting a louder exhaust, should definitely get the drone suppression pipe with a mufflex system. In fact, with the drone suppression pipe, I would now be willing to buy the 14" muffler.

I feel it is well worth the money, as I was prepared to pull the mufflex system off and put something else on. This now hits the sweet spot between an exhaust with a performance sound I can hear and acceptable drone without having to buy a different system.

Here are a couple installed pics:



Glad to see this review. I have one these sitting in my garage for the last 8 months, just haven't had the time to install. I really don't mind the drone, but my wife hates it. I want to install this before we go on any road trip with the truck. Thanks for your input!
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Old 05-12-2014, 01:54 PM
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I just recently had the Mopar Catback installed on my 2013 Ram 1500 Laramie with 8-speed trans. I LOVE how it sounds overall. The only issue is that I went on my first long trip this weekend where speeds were at or above 70mph and RPM's were around 2000 or a little higher. The issue is that there is some severe cabin drone at this range. Do you guys think this drone suppression pipe will help without losing power or the deep throaty sound I love so much now?
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