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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Inside of 550i stock mufflers
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      08-23-2017, 01:09 AM   #23
james23
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Quote:
Originally Posted by ELECEngineeringPhD View Post
Hey James23 (I can only assume a LeBron fan), I can't figure out how to see your images on Photobucket! However, I really want to know what the stock 550i mufflers looks, as I want to modify them myself, but I only plan to cut a small section to pull fiberglass. I need to know where to cut.

Anyway you can share those images another way in this thread? Or you are welcome to PM me with the images. I've been looking everywhere for the 550i mufflers cut open but can't find them!
Seems like Photobucket now wants money for being able to link pictures to 3rd party sites. Check the original post. I uploaded the pictures to a new hosting site.

I never finished this project. I ended up putting on M5 mufflers and then went back to stock.
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      08-24-2017, 03:21 PM   #24
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Thanks for the update! This helps a ton!!! I plan to modify my stock first (and for fun); however, if it goes south, I'll dump it and put on a Cherry Bomb + dual stainless tips.

Wish you were able to finish and post some results and a video. Maybe I'll share if I can get anything that sounds decent. Thanks again!
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      02-10-2022, 02:47 PM   #25
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Hi guys,

know I blow 4 years of dust off this thread, but interested if someone else has accomplished this axle back mod.
Seems to be a decent (and compared to after market axle backs a fairly cheap) sound upgrade if one has some welding capabilities.
Needed some zoom into the pics in the first post to get behind the secret of air flow in the pot

Hope the air flow I marked in the two pics is right - first the engine breaths in the middle chamber
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Then it flows from the middle chamber through the 2 180° elbows out to the tips
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james23 mentioned he wants to weld a Y piece into the middle chamber (if I understood that right) to connect the incoming pipe from the engine directly to the outgoing ones connected to the tips
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What do you think about the idea of just cutting the middle chamber pipes off at the chamber wall - would that add a lot of drone and/or would the chamber swallow a lot of the intended effect of getting a better/louder sound since the airflow is just lack of the 180° ellbows?
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Last edited by Eisbaer Lars; 02-10-2022 at 03:35 PM..
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      12-29-2022, 01:56 PM   #26
batdevice
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Thank you Eisbaer Lars for bringing this thread back to life, I would love it if someone would do as you mentioned above and just cut the middle chamber pipes off at the chamber wall. Who out there can complete this proof of concept for all us 550i owners....
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      01-10-2023, 10:09 AM   #27
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That would be great @[batdevice] - if someone has done that or is willing to do this tweak and could report out it would be a good opportunity to leave the original axle back and have at least a little more sound of this beautiful engine!
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      03-29-2023, 10:07 PM   #28
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Hey everyone,
I just picked up a 2011 550i xdrive and I couldn't stand how quiet it was so I found this thread and thought I'd give the idea a try. I will attach a video once I get manual valve control (Bimmerlink) but I attached the photos of my process. I cut a small flap in the muffler based off the ridges in the dissected photos and they worked perfectly. then, I cut the exhaust tube going to the valved exit and welded everything back to normal. It looks basically stock and sounds completely stock with the valved closed. My initial drive felt completely normal and honestly nothing sounded different. I can't tell when the valve opens and I have no way of testing out the sound besides forcing the valves with a screwdriver so I am waiting till I get the Bimmerlink app to get a sound clip. I did try holding the valves with two screw drivers and revving and it was much nicer sounding. I can't say for sure yet but so far it seems like a success! The revs were louder but not nearly as loud as a muffler delete (as far as I can tell from youtube videos).
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      03-31-2023, 03:05 AM   #29
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Great - really appreciate the effort you took - keep us posted as soon as you have the valves opened and the video w/ sound available
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      03-31-2023, 03:24 PM   #30
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Can you post if there is any drone when cruising on the highway.
Watching with excitement.
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      03-31-2023, 05:56 PM   #31
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Isn't this just a muffler delete but with more steps?
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      05-03-2023, 03:39 PM   #32
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Hi TyCary,

I'm also interested in this mod.

Any drone during steady crusing?
Can you post a sound clip at few different speeds plus while accelerating?
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