Simple stock exhaust modification - Mercedes Benz SLK Forum

Performance MODS for the R170 Tuning and Performance modifications for your SLK

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#1 Old 10-27-2016
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Simple stock exhaust modification

I recently purchased a 2000 SLK230 and I was wondering if anyone has modified the stock muffler. It appears on the exhaust diagram that the exhaust comes from the engine and then passes through a few chambers before leaving the tip. I was wondering if anyone has tried connecting the exhaust that is coming from the engine to the final chamber leaving the tip to ease flow and slightly increase noise. This is one mod that I have seen before on Porsche Boxsters. I haven't seen a diagram of the inside of the SLK muffler to confirm that this would work, but if it did, all you would need is a muffler shop to drill two holes and weld in a connector pipe. It would probably very cheap. Any thoughts or expertise on this would be awesome.
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#2 Old 11-01-2016
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Exhaust innards

Has anyone ever cut open the stock exhaust of an slk230?
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#3 Old 11-01-2016
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Exhaust innards

Or does anyone have the ability to cut into an extra? I feel like if we knew how exhaust flows through the stock muffler, a simple connecting piper could be attached by any local welding shop that would give a better exhaust note while keeping the stock look, and costing much less.
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#4 Old 11-01-2016
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Sacrificial exhaust

If someone has the parts and know how, can they post a diagram of airflow through the exhaust?
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#5 Old 11-09-2016
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Exhaust opened up.

So,


My neighbors and I cut open a 3 sided panel on the top portion of the muffle. The muffler actually has a lot going on inside of it. When I get a chance Ill post a few of the pictures I took. I was considering gutting the inside of the muffler, but my neighbors and I discussed it, and figured that it might be too aggressive, and sound bad. The inside of the muffler has a bunch of lines and baffles, and a ton of steel wool type packing material. So, I sacrificed a utility blade and cut it all out, and then vacuumed the inside. We used some metal duct tape stuff to temporarily seal the exhaust and then I hung it and started the car. It sounds a little louder, but not too much, which is probably exactly what I'm looking for. Also, the car looks stock.


The hard part was getting it welded back together. Please note that the slk 230 muffler is stainless steel. I don't know much about welding, but basically welding stainless has to use a Tig welder, which are expensive machines to use. My go to welder didn't have one, but he had a friend. Instead of the weld costing 40-50, it cost 100. Part of that is also due to the fact that where I live there's not a lot of competition, so you may be able to get it cheaper.


I have not had a chance to drive the car around yet to check for drone with the windows up or down, but I will update. If this is a success, it will be a very cheap way to mod our r170s for a little better airflow and exhaust note.


***Uninstall notes***. If you have a higher mileage car like mine, your exhaust bolts will be seized, but the way the exhaust flange meets there is ample room for a dremel with a cutting wheel on all three bolts between the two mounting pieces. I just cut them off, and then used penetrating oil and a hammer to free the bolts from either side and replaced them. Not a big deal. Post questions if you've got them.
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#6 Old 11-10-2016
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Pictures please! I was thinking the same thing after looking under my car to measure the muffler with thoughts of changing it out. I saw the other pipes going in and out and wondered if there was a way to bypass them or something. What you did sounds like what I would like to try. I also have access to a tig welder at work so it would basically be a freebie mod.
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#7 Old 11-18-2016
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Originally Posted by marvel View Post
Pictures please! I was thinking the same thing after looking under my car to measure the muffler with thoughts of changing it out. I saw the other pipes going in and out and wondered if there was a way to bypass them or something. What you did sounds like what I would like to try. I also have access to a tig welder at work so it would basically be a freebie mod.
I uploaded a diagram I made of the exhaust innards. The red arrows denote the flow of exhaust. Th picture is looking at the top of the muffle with the intake from the engine on the right , and the exhaust tip on the left. The top tube with the green rectangle is what all of the tubes looked like when I opened it up. They all had a bunch of steel wool packing with a bunch of what looked like broken down and burnt up foam or some other insulator. I used a nice sharp razor blade and cut through it all and just ripped it out, and followed up with a shop vac. It gets wedged pretty good around the sides, so I just used a bent screw driver to get it free and pull it out. I was considering cutting out some of the innards, but instead I just opted to pull out all of the packing and then re-weld it back.

**RESULTS**

The exhaust note is slightly louder, most noticeable above 3k RPMs. It is not really noticeable at all with the windows up. There is no drone that I have found, and without the windows or top down you wont really notice the difference. My neighbor and I agree that it is an improvement in sound. If you want a subtly more aggressive exhaust note, then this is the mod for you. Also, it does seem like the exhaust breathes just a little better. When I first started it and drove it, there was some hesitation, but the ECU quickly adjusted and its been super smooth since.


***REMINDER***

The muffler is stainless steel so you will need a tig welder to reseal it. Also, when you cut it open use the thinnest cutting wheel you have to make the welding easier. I used a relatively thin cutting wheel on my angle grinder and it worked well.

Feel free to PM with questions.
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#8 Old 11-19-2016
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Thanks for the pictures. I was thinking that it worked like that. Was the third pipe, the one in the top of the picture and still covered with the packing, perforated like the other 2? I can see it flowing better without all the packing in it. I think that might be a weekend project for me soon! Good job!
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#9 Old 11-21-2016
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All pipes were completely covered in packing. I removed it all and all pipes had perforated holes. I just took the picture to show the difference.
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#10 Old 11-24-2016
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Great thread. I'm looking to try and get a little more noise, may give this a try in the spring.
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#11 Old 11-25-2016
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I drove it with the top down for the first time the other day and I really like it. It stays in the lower frequency band up to about 3400 tpms then it gets a nice kind of grumble. Not like some deep grumble from a v8, but what you would expect from our motor. To me it doesnt sound cheap and is a cool improvement.
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#12 Old 12-01-2016
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Originally Posted by Opey521 View Post
All pipes were completely covered in packing. I removed it all and all pipes had perforated holes. I just took the picture to show the difference.
OK! Just wondering as it looked like that pipe was a non perforated one. Also, did you have much trouble removing the cross bar/ stiffening bar that runs under the exhaust pipe?
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#13 Old 08-03-2018
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Hi guys would you think this would be the same for the SLK 200 2009 171model . I did this same procedure on my motorbike a Ducati 999 and gave it a great sound with much less money than a aftermarket system .
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#14 Old 08-03-2018
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Hi guys would you think this would be the same for the SLK 200 2009 171model . I did this same procedure on my motorbike a Ducati 999 and gave it a great sound with much less money than a aftermarket system .
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#15 Old 08-03-2018
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My experience is that a turbo or catalytic converter both make good mufflers. I have run straight pipes out of both and never been stopped (did have to add an X pipe to the Judge but is a different story.

Further both 6s and 4s with relatively mild cams perform better with a single properly sized pipe.

Best sounding V6 I've had was a DOHC Grand Prix with 5 speed.


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#16 Old 08-03-2018
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I'm about to remove the muffler on the V8 tonight... I'm amazed how quiet the stock 230 exhaust is - can barely hear my V8!
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#17 Old 08-03-2018
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I am on that road myself, bought a set of rear boxes from ebay and waiting for delivery.
Bought some 1mm cutting disc to open the boxes and run straight pipe instead of the s shape pipes.

Remote installation of Passthru, C4 DAS/Star Mercedes, XENTRY,EPC/WIS
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#18 Old 08-04-2018
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Not sure if I have a standard exhaust.
car has extractors, (not standard ) into single 2 and 1/8 inch pipe down to dual resonators (?) then single 2 and 1/8 inch to rear muffler.
Factory?
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