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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications How do I disable the exhaust flap on the 550i?
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      05-03-2011, 03:03 AM   #1
Fantasm
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How do I disable the exhaust flap on the 550i?

Does it get any louder with the flap disabled? How do I disable it?
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      05-03-2011, 10:41 AM   #2
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If anyone can help on this...I also would like to know. Thanks.
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      05-03-2011, 11:30 AM   #3
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there is a vacuum tube that plugs into the muffler and perhaps you can disconnect it and ask your local muffler shop to either take out the flap completely or some kind of welding to make it stay open.
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      05-03-2011, 01:22 PM   #4
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Solution - buy a Supersprint exhaust!
Flap open or not, will make almost no difference in sound.
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      05-04-2011, 01:25 AM   #5
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is there possibly a fuse that can be pulled that operates the flap?
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      05-04-2011, 08:48 AM   #6
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Quote:
Originally Posted by Fantasm View Post
is there possibly a fuse that can be pulled that operates the flap?
good suggestion..there should be..a friend of mine removed the fuse on his ZR1 that i believe also has a similar set up. You should hear that car accelerate!!
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      05-08-2011, 04:06 PM   #7
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Anyone know which fuse controls the exhaust valve?
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      05-20-2011, 07:48 AM   #8
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Quote:
Originally Posted by Fantasm View Post
Anyone know which fuse controls the exhaust valve?
According to the diagrams at Realoem.com, it's vacuum controlled.
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      06-17-2011, 10:23 AM   #9
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why would you want to do that on a turbo car wont it create a lag?
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      06-19-2011, 11:45 AM   #10
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On the mufflers, locate the flap, on top of the flap youll see a mecanical arm which opens and closes that flap. On the mecanical arm youll see a circular thing with a rubber tube(vaccum line) vonnect to it. You must remove the tube from the circular thing(use some wd40 it can get stuck some times) and then when the tube is off youll want to plug it, either fold and zip tie or use 2-3 layers of duct taoe to ensure an ajr tight fit. Some recommend a golf tee...stay away from that...its hard to get it out after.
Of yeah and once the tube is plugged, just tape it onto the side of where it originaly was but on the opposite side of the muffker of it will melt the tape lol.
I beleive the 550i has this on both side so repeate other side.
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      06-20-2011, 05:37 PM   #11
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Quote:
Originally Posted by beemw View Post
On the mufflers, locate the flap, on top of the flap youll see a mecanical arm which opens and closes that flap. On the mecanical arm youll see a circular thing with a rubber tube(vaccum line) vonnect to it. You must remove the tube from the circular thing(use some wd40 it can get stuck some times) and then when the tube is off youll want to plug it, either fold and zip tie or use 2-3 layers of duct taoe to ensure an ajr tight fit. Some recommend a golf tee...stay away from that...its hard to get it out after.
Of yeah and once the tube is plugged, just tape it onto the side of where it originaly was but on the opposite side of the muffker of it will melt the tape lol.
I beleive the 550i has this on both side so repeate other side.
will this or replacing the muffler with an aftermarket throw any codes/cels/ or engine lights?
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      06-22-2011, 08:20 AM   #12
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Quote:
Originally Posted by '11 Bimmer View Post
will this or replacing the muffler with an aftermarket throw any codes/cels/ or engine lights?
Your exhaust flaps are controlled by vaccum, some people said that if there is a vaccum leak( if you dont plug the tube) that it stores a hiddn vaccum leak code...but its all bullshit the dealer cant deny any work for disconecting a vaccum flap. I suggest just asking your service advisor if he knows how to disconec it....if he knows a little bit about these cars, hell tell you that you can unplug a connector in the trunk that disables the vaccum, dont do it without him knowing, because this way WILL store a code.

I know it sounds complicated, but its not: If you want to see what it sounds like, pull off both vaccum tubes on both sides of the exhaust and seal them with a couple of layers of duct tape and then drive around if you like it then just make sure that ou sealed the tube well and then just tape it back to the thing it wa connected to. If you dislike the sound, then take off the tape and clean the residue(it leaves a bit of sticky stuff) and put it back on.


My advice to you: BMW performance exhaust....Im not sure if they have one yet for the 550i? If they dont, theyll have it soon!
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