Resonator Removal on an SLK32 - Mercedes Benz SLK Forum

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#1 Old 04-30-2010
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Resonator Removal on an SLK32

I had the Santa Monica Midas Muffler shop remove my resonator and fabricate a y-pipe and an exhaust section to connect the exhaust system together where the resonator had been. I didn't want it to vibrate and sound buzzy, so I asked that as much of the exhaust prior to the muffler remain and for a hanger to be welded to the new pipe to use the old hanger mount that used to hold up the resonator. The new exhaust pipe section gets a couple of bends as a result to miss the read diff, to get close to the old hanger mount, and to reconnect near the muffler

They charged me $29.95 for parts, $2.92 sales tax and $175 for labor (just under 2 hours of labor @ $95 per hour) for a total of $207.91.

It sounds deeper and more of a growl over 3000 rpm. I don't notice a big difference on idle sound. Haven't found a drone or a buzz yet, but I haven't driven many miles yet.

Pics attached are:

1 and 2: stock exhaust before any work
3. the new y-pipe
4. the removed resonator
5. the new system nearly completed (needs a hanger)
6. the completed system with hanger welded to the new exhaust section at a point that uses the old hanger mount from the resonator.
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File Type: jpg P1010005.jpg (91.3 KB, 73 views)
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#2 Old 04-30-2010
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You'll probably notice a BIG difference in sound when you put on those headers you ordered.

you did order them.. didn't you???


how heavy was that resonator? Looks like I can use it for a boat anchor!
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#3 Old 04-30-2010
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Here is a youtube file comparing the exhaust sound stock vs resonator removed. I didn't get the camera position perfectly the same, but it is very similar. The stock exhaust sounds louder on the clip (but I think that is a function of camera position) IRL the resonator removed sounds are a little louder. As I think can be heard on the clip, the exhaust sounds more snarly with the resonator removed...which I like a lot! Too bad the supercharger whine is louder than the exhaust in both sections of the vid. My camera picks up the supercharger sound (and the jangling key sounds!) very well.

The resonator is kinda heavy..I will weight it officially, but I would guess 20 to 25 lbs holding it. No boat for me, so I guess it will have to be a paper weight or a sculpture for my living room.

EDIT: Using a bath room scale, the resonator and the two short tubes removed (as pictured above) weighs 22 lbs.

headers....hrrrm....


Last edited by Santamonica SLK32; 04-30-2010 at 10:41 PM. Reason: Added resonator weight
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#4 Old 04-30-2010
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Congrats, enjoy the new mod

06 SLK55 AMG (Kleemann K2)
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#5 Old 05-01-2010
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Sounds deeper and much more "throaty" with the resonators removed Can't wait to hear it in person.

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#6 Old 05-01-2010
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Just for kicks I put my Tricorder up to the pc speaker (yes, it really is called Tricorder.. but it's just an app for the Droid that has a spectrum analyzer in it) and the stock exhaust is pretty flat curve, peaking around 1.6kHz. With the resonator deleted, theres a dip in the curve at about 1.2kHz and a pretty good rise around 800Hz. Which just means it is producing more low frequency than before.
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#7 Old 05-04-2010
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Sound Update:

Now that I have driven around for a few days with the resonator removed, here is what I have observed:

Very little change in sound level at idle or at normal cruise (meaning not accelerating).

Small drone at light throttle in the 1800 to 2200 rpm range in 2nd and 3rd gears.

No drone at freeway cruising speeds of 65 to 80 mph. (2500 + RPM)

No drone going uphill on freeways at speeds of 65 to 80.

Very nice throaty snarl at 3000 rpm and above. Definitely louder and more aggressive than stock, both with top up and top down. Exhaust note at WOT is really hot sounding. If you have a solid wall to the side or are in tunnel, it sounds extra aggressive.

I am very happy with this mod!
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#8 Old 05-04-2010
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I tried to play the youtube video and got an error message. Is it just me?
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#9 Old 05-04-2010
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Quote:
Originally Posted by Sulley007 View Post
I tried to play the youtube video and got an error message. Is it just me?
I am a youtube novice, but as far as I can tell, the video is open to public view. And there are 26 views of the vid noted by youtube. That's more times than I listened to the vid

I can view it now on youtube, but as the account holder that might not be a good test. If nobody else can view it now, I can try reloading it to youtube or I can try VIMEO.
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#10 Old 05-04-2010
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Very nice, JEALOUS! Your SC is louder than mine, did you remove the intake baffles?


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#11 Old 05-04-2010
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Originally Posted by paultalb View Post
Very nice, JEALOUS! Your SC is louder than mine, did you remove the intake baffles?
Honestly not sure where the intake baffles are on an SLK32. I just put in green air filters and didn't notice baffles in the air box if that is their normal location.

Honestly, I think the loud S/C noise is an artifact of camera location and having a camera with an unsophisticated microphone. My camera picks up certain sounds much better than others...probably tuned for human voice recording. The S/C doesn't sound as loud in real life as on the vids.

I noticed other SLK32's exhaust vids sound more life like (meaning normal S/C sound level) if the camera position is off to the left of the car rather than centered behind the car. I'll try that position and edit the vid into this post.

EDIT: Youtube clip of exhaust sound outdoors and a little left of the car:


note: sitting in the drivers seat with the door open while making the clip, the exhaust rev sounds were LOUD, while the S/C sounds were quite muted. Again the S/C sound in the vid is "louder than life"

Last edited by Santamonica SLK32; 05-05-2010 at 12:30 AM. Reason: Added youtube clip of exhaust
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#12 Old 05-04-2010
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Quote:
Originally Posted by Santamonica SLK32 View Post
Honestly not sure where the intake baffles are on an SLK32. I just put in green air filters and didn't notice baffles in the air box if that is their normal location.
right before the filter box, I'll take a pic.


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#13 Old 06-19-2010
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Quote:
Originally Posted by paultalb View Post
right before the filter box, I'll take a pic.
Ok, it took me almost 2 months to check this out. I opened up the intake filter box and took off the intake tube that routes cool air from the front (next to the radiator) to the air filter box.

In pic 1 ("borrowed from an MBworld post), I have the same type of baffle inside the intake outer tubing labeled "A" in both pics. But the air passage through outer intake tubing labeled "B" in the second pic (my intake in this case) is not blocked...its open to the filter box and the air filters. So in my intake, I can't see how air is forced through the baffle holes in section A. It looks like air would flow through the center of the "baffled tube" without significant restriction and into the air filter box.

Any other SLK32 (or C32) owners check out this intake tubing on your cars? I don't know if a prior owner cut off the back half (air filter side) of the of the baffle tube to open the flow, or if the stock baffle already allows open flow through the center of the tube into the airbox. Intake illiustrations on EPC don't show enough detail to know what a stock baffle should look like inside the intake tube sections which I labeled A and B.
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#14 Old 06-19-2010
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Found a better pic on benzworld to decribe all this. Baffle C sits inside outer tubing section A. In my car, Baffle C is open both ends, so I can't see a restriction to air flow that would cause much air to flow through the small holes in the tube walls of baffle C. Is the stock baffle C capped off on the air filter side? Or at WOT is there enough air flow through the center of baffle C to force noticable amounts of air through the small holes in the baffle?
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#15 Old 06-21-2010
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I had the Burbank Morse Muffler shop remove my resonator and fabricate an exhaust section to connect the exhaust system together where the resonator had been. I didn't want it change tube length and change the exhaust pulse. So this was their solution.
The new exhaust tubes section gets a couple of bends to get close to the old hanger mount, and to reconnect near the muffler.
This was a very clean and professional fabrication and installation. No crease or wrinkles in the bends.
The proper tube length maintained and a factory “Y” where the resonator exit would be located. even reattached the ground strap.
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#16 Old 06-21-2010
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Great looking install Gizx! Hope you don't mind me asking: what did they charge for the work?

Also, if you can, please make a vid/sound clip of the exhaust sound and post it up
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#17 Old 06-21-2010
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It was $250.00 cash about 1:45 to do the work while I was waiting, and they let me snap the pic’s while the car was still on the rack. I’ll try to get a sound clip this week.
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#18 Old 06-23-2010
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airbox baffles are stock. i removed all that stuff and added a custom setup to flow as much air as the slk32 airbox will allow
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#19 Old 11-17-2010
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I am considering doing this mod... I recently had my AMG exhaust tips replaced by my indy and had all this tubing staring me in the face, and I remembered the resonator removal thread. I am happy with the sound of the stock 32 exhaust but there's always fun in customizing it a little to make it "your own". Looks straightforward and parts wise probably a Y-pipe is all that is needed.

I am on the fence for an Eisenmann exhaust but I am trying to figure out how to keep my AMG tips if I go with an aftermarket muffler. Plus, $250 for resonator removal mod vs $1300-ish for an Eisenmann (supposedly they are custom made when you order), that's a big difference.

I have next week off for Thanksgiving and need to do a mod to keep me sane! Yes I have the bug... haha
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#20 Old 11-17-2010
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Personally, I love the sound of my exhaust with the resonator removed, especially top down and revving hard above 3000 rpm. But I know a couple SLK32 owners (through benzworld) who don't like the exhaust sound with the resonator removed. Minor top up drone around 2000 to 2200 rpm, but with top down no drone at any rpm.

The Eisenmann exhaust as $1300 is too pricey for my personal taste, but I would be curious to hear the sound of your exhaust if you use it.
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