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  #1  
Old 12-01-2009, 04:19 PM
MS Fowler's Avatar
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Can you just add a center muffler?

I have an '82 300SD. Last year I had a complete exhaust system installed. The system I replaced did not have the center muffler. The new system seems just a little loud for the character of the car. Seems like I could just cut the exhaust pipe, and put a 90 degree bend, muffler to the passenger side, and then return to the existing exhaust pipe with another 90 degrees bend.
Is that possible?

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Old 12-01-2009, 04:41 PM
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Possible? Sure. Good idea? No...
Gasses flow similarly to water and 90 degree bends will ruin your airflow.
Having never messed with a 126 I'm a little out of my element but as nobody has yet replied...
On a 123 the "center" muffler actually lives way up front, pretty much under the passenger seat. The exhaust then goes across the car to the rear muffler which is on the other (driver) side of the car.
So rather than crazy 90 degree bends just get a muffler, cut a muffler size hole in the pipe you've already got and insert said muffler inline.

Unless the car is real loud I probably wouldn't worry about it. I *think* you've got a 617 engine and in my experience the engine part of the car is louder than the exhaust part of the car anyway. My wagon lost its rear muffler once and we drove it for several months with just the center muffler, it was a little louder but not bad...

My 240D has a leak where the manifold meets the exhaust, I presume theres a gasket that goes there (haven't spent any time on it yet) but when the engine isn't totally warmed up it makes noise when I'm on the throttle (most of the time in a 240D ) maybe you've got a similar issue?

HTH!
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Old 12-01-2009, 04:44 PM
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If you had one there before there is room to put one back.

If you are not doing the job yourseif; I would go to several Muffler shops and get some estimates and ideas on what to do.

The Muffler shop will have some ideas on keeping the exhaust flow going as straight back as possible.
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Old 12-01-2009, 05:33 PM
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I did that. My downpipe and center muffler had rust on my 83, the rear muffler and most of the pipe was fine. I did the downpipe, and had a shop cut from the flange to solid metal by the rear (maintaining as much OE pipe as possible). They welded in a center "resonator", I got a high flow one figuring that I didnt want to impede flow, just ensure quietness, and it was perfect.

Now, it sounds like you got some "custom" setup, which may not route as OE did. In that case, I don't know how to tell you to do it, given there have to be support, etc.
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1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
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  #5  
Old 12-01-2009, 06:18 PM
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I talked to a muffler shop years back and they sold me a nice glass pack to run directly under the drive line in that cove that is there. it worked well, i ditched it for straight pipe. but now i wish i had it back. I'm thinking of going 3in and installing a 3in glass pack straight down the middle.

something like this
http://www.jegs.com/i/Cherry%20Bomb/545/87518/10002/-1?CT=999
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  #6  
Old 12-01-2009, 06:22 PM
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Quote:
Originally Posted by MS Fowler View Post
I have an '82 300SD. Last year I had a complete exhaust system installed. The system I replaced did not have the center muffler. The new system seems just a little loud for the character of the car. Seems like I could just cut the exhaust pipe, and put a 90 degree bend, muffler to the passenger side, and then return to the existing exhaust pipe with another 90 degrees bend.
Is that possible?
I'm going to suggest that you do not need a "center muffler". The problem is not the lack of the center muffler.

I had the resonator removed from the SD and the shop put a bracket at the approximate location of the resonator to support the exhaust system between the downpipe and the rear muffler rubber donuts.

Completely unacceptable...........and a definite resonance thoughout the cabin.

Back to the shop and they make some type of adjustment to the new bracket..........but, still didn't "hang" the system.

Unacceptable.

So, finally, they remove and discard the new support bracket and the system lives with only the donuts on the muffler.

Problem solved. The SD makes no more sound than it did without the resonator with the exception of precisely at 2000 rpm. There is a very slight drone at that discrete rpm which is not objectionable.

So, crawl under there and see what the fools did...........if any solid mounts exist between the pipes and the body............they have to go.
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Old 12-01-2009, 06:27 PM
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the stock SD muffler is actually 2 mufflers, think it is refered as a Kidney
muffler. how many do you want?

http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1982@@1982&makeid=63@@MERCEDES+BENZ@@X&modelid=6206%3AMBC%7C1510%3AED%7C10000134@@300SD&catid=241035@@Exhaust&subcatid=241069@@Muffler&applicationid=W0133-1715622&mode=PA

Charlie
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Old 12-01-2009, 06:46 PM
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I had my exhaust only hung via the stock dounuts at the muffler and it would alway fall off and drag, that anoyed me so I made a soild mount... now that anyos me LOL I must be a hard man to please. anyway, what other options do I have? anyone have any good ideas?

I'm thinking something that won't hang as low as the stock dounuts, but with flex in it.

my solid mount is bolted into the bolt holes that hold on the heat sheild in the middle between the drive shaft and the exhaust.
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Old 12-01-2009, 06:51 PM
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anyway, what other options do I have?
...........spend the $2.00 and 15 minutes..........every year...........and replace the rubber donuts...........
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Old 12-01-2009, 08:19 PM
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Thanks for the inputs, all.
Brian, your comment makes a lot of sense--the old system did not have the center muffler/resonator, and it seemed quieter. In fact, the sound is more of a "boom" than loud exhaust. I bet there is a non-approved hanger somewhere in that system.
Thanks.
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Old 12-02-2009, 05:22 AM
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I had the resonators removed on my SD also, I asked the mechanic to rig up a rod supporting the straight pipe, welded it to the pipe, and extended to the sides of the car, bent the ends so I can use the stock resonators with stock hangers, the donuts. No problems and the engines sounds better all the time, don't even miss the radio.
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Old 12-02-2009, 08:18 AM
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If the pipe length is off and a donut is pulled too tight it won't isolate properly. If this is the case, correct the pipe length, add a donut or otherwise reduce the tension.
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  #13  
Old 12-02-2009, 10:46 AM
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I have a straight 2.5" pipe on my SD....and it is only supported at the engine/trans and in the very back where the muffler used to hang.....when driving along with the windows up, it is no louder than it was with the entire stock exhaust system.
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  #14  
Old 12-02-2009, 11:43 AM
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Quote:
Originally Posted by Brian Carlton View Post
...........spend the $2.00 and 15 minutes..........every year...........and replace the rubber donuts...........
not talking about the rear, talking about the certer... I really don't feel like adding 2ft bars to ether sidde of my pipe so i can used the hangers that were at the end of the kidneys.
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  #15  
Old 12-02-2009, 11:56 AM
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not talking about the rear, talking about the certer... I really don't feel like adding 2ft bars to ether sidde of my pipe so i can used the hangers that were at the end of the kidneys.
I agree, although one of the members had done exactly that.

The system hangs fine with just the support in the rear. I'll find out what the long term effect will be..........but, I don't foresee any.

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