[PG325]

I've noticed over the last few days that the exhaust valve appears to be rattling regardless of it being in comfort or sport.

I'm hoping that replacing the valve spring will resolve but my other option would be replacing the back box

is the 340 or 440 back box a direct replacement for the older 435 varient?

[Alscoob]

You could just unplug and leave the valve open, see the topic 340i exhaust flap rattle. Post #7 https://f30.bimmerpost.com/forums/sh....php?t=1684218

[PG325]

Originally Posted by Alscoob

You could just unplug and leave the valve open, see the topic 340i exhaust flap rattle. Post #7 https://f30.bimmerpost.com/forums/showthread.php?t=1684218

I think the problem with that is the problem of the valve closing when refitting

[Iyrix]

Just get it modified. Will sound a lot better!!

[Alscoob]

Originally Posted by PG325

I think the problem with that is the problem of the valve closing when refitting

If you use the correct plug the valve will not close once open as there is no connection to the valve. The adapter plug avoids any fault codes showing up.