simon1966

So do you reckon that the simplistic diagram I drew up is basically correct? I am now thinking that maybe the muffler is just opened up to expose the small chamber, then cut out the inlet that connects to the 'u bend' and then block off the 2 holes that connect to the 'u bend'. In that way the inlet will come into the small chamber and then straight out through the 2 pipes to the tips. There may be no need to open up the main chamber at all

stockC43

That's exactly what I was thinking. Not sure where I stole this diagram from, may of been yours but it shows the direction of flow. I'm thinking just cut out the orange pipe, then block off the u bend along the blue line of the chamber.

simon1966

Yep - that's exactly what I'm thinking

Not sure if anyone has done that before but to me seems a sensible idea but as said I really have no idea about these things.

I reckon you ought to man up and brave the cold and give this mod a go this w/e!!! Then report back to me your findings

stockC43

Lol, well we'll see. I'm betting it won't happen this weekend though. 6-10" snow Saturday with the Super Bowl Sunday. The cars in the garage but ill be busy dealing with the snow.

simon1966

Haha - I heard there may be some strange so called football game happening over there. Of course we play proper football this side of the pond

Good luck with the snow - I reckon its probably going to head our way.

James M

Not sure why you would want to block the u-bend off - we just cut the u-section off completely and removed the sound deadening material. I would love to send you a video clip of my exhaust, but I am a moron and my 12 year old is not here to help me out.

stockC43

Oh yea, your in England. Honestly I could care less about the Super Bowl but its a excuse to eat good food.

"James,
Not sure why you would want to block the u-bend off - we just cut the u-section off completely and removed the sound deadening material."

Without hearing one in person I would think it would sound to hollow or echoey for my taste. I'm not a fan of the chambered flowmaster sound and once you remove the material, there's no going back. I'm guessing removing the u bend "should" make it 50% louder with out changing the sound too much. This obviously is all trial and error though.
I would love to here yours if you could get some sound clips uploaded.

C32owner

Hey James,
We can always get together again and I will bring my gopro to make a video of that beast of yours rumbling through the jungle!

James M

Sweet - what are you doing tomorrow? Thought you were flying this weekend?

James M

There is another thread going on this forum where the owner has ditched the muffler completely and just gone with a Y-section from the main pipe going into the two exhaust tips. This is very similar to what mine sounds like, but lets see if I can get a clip posted tomorrow.

simon1966

That made me laugh, you sound just like me with technology, I'm totally useless, I can't get any attachments or vids to work.

Anyway James, I can tell yours is going to sound like a beast with the system you have. 88mm pipes, no cats, long tube headers and gutted mufflers

Trouble is my car needs to sound reasonably subtle as I live close to my neighbours and visit clients in my car. It seems like stockC43 is on similar thought lines to me but then I'm making it up as I go along

austingtir

Im thinking just cut the orange bit and leave the rest. So cut it at the chamber instead of the u bend. Then if you dont like it go back in there and blank off the u bend aswell.

simon1966

Yeah that would be simpler and maybe with same results.

I would have thought the principle of opening the small chamber would have been looked at before though. I've only seen threads on opening the main chamber.

Lawrence1

I know this may be a lot to ask but can you take a couple of videos of your setup with your phone and post them?

chiromikey

I can...but it won't be until I get back home next week.

Mulletmudbogger

I had my stock mufflers baffles cutout and all material removed

My advice is DO NOT CUT ANY METAL inside the muffler. I think removing the fiberglass stuff is ok

My mufflers ended up droning so bad they RATTLED THE MUFFLERS and it sounded like some beat up old truck.

The problem was I had hacked up the mufflers so and I couldn't easily return them to stock

So I had to pay $500 for some used oem ones.


I now have some 3" cutouts installed right before the stock mufflers and it sounds awesome!! Quiet when I want, screaming loud at the press of a button

IMO exhaust options include

1. Straight pipe. You can reinstall the muffler later if needed

2. Open muffler and only remove sound dreading. Again could reinstall if needed

3. Cut outs


The reason I stress not cutting the stock mufflers metal inside is the high price of a stock replacement or difficulty going back to stock. Think twice before hacking up your stock muffler I wish I would have!

Mulletmudbogger

3" cutout. The electric motor valve part is not bolted up yet.

I also installed a wireless control, Was easy! The battery is in the trunk, so no wires to run

Mulletmudbogger

Wire is dangling, about to hook it up

I used the optional downturns

simon1966

Great info Cheers

I hope to take my car into an exhaust shop this week and get them to have a quick look and decide which way to go. At this point I'm thinking of getting them to cut open the small chamber and cutting the main inlet so it discharges into the small chamber and therefore not going into the main chamber via the u-bend. Not sure what this will do but it will be interesting to see inside this chamber and try it out.

Would be great if someone had already tried this but.......

Mulletmudbogger

Omg I just realized that there is a video of the tectite grey e55 with the gutted mufflers on this thread THAT IS NOW MY CAR! Yup do not do what those photos show. The muffler rattles like a beehive at certain rpms


Here's a photo of a muffler shop reinstalling some oem mufflers and the cutouts

Notice the color of the car??

stockC43

What was the method you went with? Did you remove all of the wool insulation and leve the pipes in place? Did you cut everything out and leve a empty chamber? I remember seeing pix someware of someone who did that. Just trying to narrow down what doesn't work. I still think my idea about cutting out the orange bend in the small chamber should work, but who knows. we won't know untill somebody try's it and I think Simon might beat me to it.
Thanks for the words of caution

Duh, just reread your earlier post. So all of the visable perforated exposed pipes in the above picture were removed correct?

Mulletmudbogger

Yes, It was actually the previous owner who did everything, he's also a member on this forum, where I got he car There is a whole post he made talking about what he did He doesn't mention that the results rattled like a beehive He did a good job and it sounded awesome at full blast but the rattling muffler was a surprise even to him, (not his fault) I had to get those mufflers swapped out ASAP when I got he car I still think the cutouts are the way to go if your looking for crazy loud for cheap. I think the cutouts sound even better than the gutted muffler

Mulletmudbogger

I think another idea is to maybe keep all the stock internal bends and pipes but maybe replace the perforated pipes with solid straight pipes inside the muffler. I think the problem was the exhaust was dumping out inside the muffler and at certain rpms it rattled. Sounded really bad when it rattled.

Mulletmudbogger

I believe this is what was done. The previous threads show exactly what was done

https://mbworld.org/forums/w211-amg/...ml#post5581028

chiromikey

Glad to know my logic was correct...in this particular case, I'm not as dumb as I look!