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2010 2011 BMW 5 Series Forum F10
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08-23-2017, 01:09 AM | #23 | |
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Quote:
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 Then it flows from the middle chamber through the 2 180° elbows out to the tips 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 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? Last edited by Eisbaer Lars; 02-10-2022 at 03:35 PM.. |
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12-29-2022, 01:56 PM | #26 |
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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, 05:56 PM | #31 |
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Isn't this just a muffler delete but with more steps?
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