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Old 02-10-2018, 04:10 AM   #1
Sjeng
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Default 3 Inch exhaust: how to get it more quiet?

I have been using my homemade 3" exhaust for 2 weeks, and yesterday I removed it because the droning was driving me crazy. I now run my 3 inch downpipe into the stock 940T exhaust. This is very quiet but you won't believe how much torque this killed.

The 3 inch system looks like this:

-No cat
-Simons straight through muffler in the middle: https://www.dp-engineering.nl/simons...stainless.html
-Speedway baffled muffler at the rear: https://www.ebay.com/itm/Speedway-We...RaYO2~&vxp=mtr

I really liked the performance gains and it fits the car like a glove, but the sound (drone) is unacceptable for me.

So my question is: Is there I can do to quieten up this exhaust? Better mufflers?(without killing performance)
And alternatively, are there any good "quiet" high performance systems on the market?
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Old 02-10-2018, 05:29 AM   #2
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Quote:
Originally Posted by Sjeng View Post
I have been using my homemade 3" exhaust for 2 weeks, and yesterday I removed it because the droning was driving me crazy. I now run my 3 inch downpipe into the stock 940T exhaust. This is very quiet but you won't believe how much torque this killed.

The 3 inch system looks like this:

-No cat
-Simons straight through muffler in the middle: https://www.dp-engineering.nl/simons...stainless.html
-Speedway baffled muffler at the rear: https://www.ebay.com/itm/Speedway-We...RaYO2~&vxp=mtr

I really liked the performance gains and it fits the car like a glove, but the sound (drone) is unacceptable for me.

So my question is: Is there I can do to quieten up this exhaust? Better mufflers?(without killing performance)
And alternatively, are there any good "quiet" high performance systems on the market?
That Simons isn't doing hardly anything and the baffled muffler is probably 90% the cause of your droning. Fit 2 of the biggest Magnaflow oval shaped mufflers you can and it will be very quiet with little to no droning.
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Old 02-10-2018, 08:36 AM   #3
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Originally Posted by Tuff240 View Post
That Simons isn't doing hardly anything and the baffled muffler is probably 90% the cause of your droning. Fit 2 of the biggest Magnaflow oval shaped mufflers you can and it will be very quiet with little to no droning.
Came here to say this and someone already said it.

+5
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Old 02-10-2018, 09:57 AM   #4
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Is this on a auto by any chance?
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Old 02-10-2018, 11:05 AM   #5
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I'll give a third recommendation for the Magnaflows. I have a 7" and a 5" on my 3" exhaust with no cat. It's very quiet.
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Old 02-10-2018, 01:54 PM   #6
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Running a longer muffler helps.
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Old 02-10-2018, 02:05 PM   #7
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Bigger muffler. I have the same one but 2.5" with a glasspack and it's not a whole lot quieter than the glasspack alone.
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Old 02-10-2018, 02:10 PM   #8
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I have a single 3 inch magnaflow on my V8 turbo car mounted in the rear, I believe it's 24 inches across? Maybe a little bigger, 100 shipped from summit, my car at idle sounds like a n/a 240 with a full exhaust
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Old 02-10-2018, 03:19 PM   #9
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magnaflows work magic. I have a single 6x6x18 straight though with no resonator or cat and its probably 20% louder than stock. but the piping is only 2.5" which helps in that regard
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Old 02-10-2018, 03:32 PM   #10
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You could put in a cat, put in more bends, or put in a bigger/better muffler.
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Old 02-10-2018, 03:47 PM   #11
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The 3 inch system looks like this:

-No cat

Why? it is stupid to believe you gain 1HP without a cat. The crappy original stuff will reduce the power, buuuuut: A good cat made of metal and with a good geometry at the entry and the out will reduce over 95% of pollution and won't cost any power.....and reduce noise


"You could put in a cat, put in more bends, or put in a bigger/better muffler."

This, two bends at the tail pipe, two times 90° and the car is quiet, ok a lot of less drone.


Regards, Kay
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Old 02-10-2018, 03:53 PM   #12
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Quote:
Originally Posted by lummert View Post
Running a longer muffler helps.
+1!

I've also had very good luck with a Morosso spiral flow resonator and Dynomax Super Turbo muffler for an RV. I shoved the largest one I could get my hands on that would still fit in my 240 at the time.
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Old 02-10-2018, 06:02 PM   #13
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i would install 1 or 2 Helmholz resonators T-ed into the 3" pipe , these reduce drone sounds but do not impede flow.
They are basically side chambers that are attached to the main pipe. Some modern cars have them as standard (i believe the stock Camaro V8 exh system uses 2 , 1 on each bank ) just google some pics based on 'helmholz + resonator + car + exhaust' and you will find plenty of examples.

Many normaly aspirated modern cars also have similar (but way smaller) helmholtz resonator chambers attached to the intake system to help quietning down intake noises

Last edited by Janspeed; 02-10-2018 at 06:09 PM..
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Old 02-11-2018, 03:11 AM   #14
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I ran a magnaflow and a cat with my 3 inch exhaust ran straight out the passenger side.

No droning *and* enough flow at two feet from the tip to wrap your pants legs skin tight against your shins.

PS, I lived in Birmingham, Alabama at the time and had no need to meet emissions standards. Sure seemed to eliminate lag
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Old 02-11-2018, 07:41 AM   #15
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I've used Simons straight through mufflers in all of my cars, zero baffled or other types. I would throw those small round ones in the bin and use oval shaped. They have bigger chamber and therefore better ability to reduce noise. With all but 3.5" Simons mufflers you can have the noise on a good level. In those the inner diameter is too big compared to the volume of the chamber.

Easiest and cheapest choice is just to replace the round front with an oval muffler.

If you are going to use straight through mufflers, you can pretty snuggly fit a 420mm(Turbolight) oval to the front and a 500mm(Turbo) long to the back. In a turbo car you might be able to use a 250mm(Turbotight) long front without too much noise. And for a good measure do a original style end pipe from two 90 bends as mentioned earlier. I'd go for 2.5" bends.

And if you want to get rid of stock cat, I'd use Magnaflow 59959.
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Old 02-11-2018, 08:10 AM   #16
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Quote:
Originally Posted by Janspeed View Post
i would install 1 or 2 Helmholz resonators T-ed into the 3" pipe , these reduce drone sounds but do not impede flow.
Yes! A lot of Z and Infiniti guys are running these. Surprised I didn't think of that earlier. Now just to see if I can find someone that makes a muffler that will fit under my 740.
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Old 02-11-2018, 08:32 AM   #17
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I run a 3" Summit Racing stainless resonator and muffler, and it's super quiet.
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Old 02-11-2018, 09:14 AM   #18
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Originally Posted by Tuff240 View Post
Fit 2 of the biggest Magnaflow oval shaped mufflers you can and it will be very quiet with little to no droning.
MagnaFlow 12219 and MagnaFlow 11249 are what I have on my GLH, they are the biggest that fit my car. Quiet and no drone.
Not cheap, but worth every penny to my ears.



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Last edited by tryingbe; 02-11-2018 at 11:03 AM..
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Old 02-11-2018, 10:44 AM   #19
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I have an 11" glass pack muffler off of Amazon on my 3" side exit. It drones way less than the ipd/Starla sport exhaust, that I had put a cherry bomb glass pack in the stock location, no resonator. One can even hear the radio while cruising, not so much at wot.
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Old 02-12-2018, 05:15 AM   #20
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Thank you for the replies! Magnaflow it is going to be then.
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Old 02-12-2018, 02:29 PM   #21
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Quote:
Originally Posted by mocambique-amazone View Post
The 3 inch system looks like this:

-No cat

Why? it is stupid to believe you gain 1HP without a cat. The crappy original stuff will reduce the power, buuuuut: A good cat made of metal and with a good geometry at the entry and the out will reduce over 95% of pollution and won't cost any power.....and reduce noise


"You could put in a cat, put in more bends, or put in a bigger/better muffler."

This, two bends at the tail pipe, two times 90° and the car is quiet, ok a lot of less drone.


Regards, Kay
I agree.
I will add another vote for “bigger is better”.
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Old 02-12-2018, 02:40 PM   #22
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Quote:
Originally Posted by Tfrasca View Post
I'll give a third recommendation for the Magnaflows. I have a 7" and a 5" on my 3" exhaust with no cat. It's very quiet.
THIS ++++++
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Old 02-12-2018, 03:45 PM   #23
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https://youtu.be/2Et4VHeo7kU
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Old 02-13-2018, 12:09 PM   #24
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Quote:
Originally Posted by mocambique-amazone View Post
The 3 inch system looks like this:

-No cat

Why? it is stupid to believe you gain 1HP without a cat.
Maybe, like me, he is tired of expensive, but poorly made cats that last at most 2 years as an emissions reducer and at worst, begin to clog or break up under high temps. I had to resort to removing my cat, EXCEPT for emissions testing, if I didn't want to buy a new one for EVERY emissions test. Glad I'm no longer in Calif.
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Old 02-13-2018, 12:14 PM   #25
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Do you know if the heat insulation wrap helped reduce in-cabin noise or is it's only value for thermal?

Quote:
Originally Posted by tryingbe View Post
MagnaFlow 12219 and MagnaFlow 11249 are what I have on my GLH, they are the biggest that fit my car. Quiet and no drone.
Not cheap, but worth every penny to my ears.

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