F10 "Flapper" Valve in my exhaust

I'm not sure which models have them and which don't, but, I do know that my 550IX has a "flapper" valve in one of the exhaust outlets. Anyone know exactly how it works and whether or not it can be coded?

p.s. Thanks to all of you guys that have helped me to get to the point where I am able to "code" my car.

Originally Posted by kwmkoester

I'm not sure which models have them and which don't, but, I do know that my 550IX has a "flapper" valve in one of the exhaust outlets. Anyone know exactly how it works and whether or not it can be coded?

p.s. Thanks to all of you guys that have helped me to get to the point where I am able to "code" my car.

The Exhaust Flapper Valve is standard in all V8 F10's, but I have no idea if it is codeable or not. I would think a muffler shop could force it open or closed full time depending on how you wanted it.

If it's like my old 330 its vacuum actuated, if you want to keep it open you just remove the hose and plug it

Since nothing is simple anymore, I figured that BMW used vacuum for the energy to open the valve, but, still utilized a electrically controlled solenoid valve to control when it opens. Oh well, I'll give it a go and let you know.

It is a butterfly valve. It cannot be coded as it runs off the vacuum pump. Search the golf tee method for plugging the vaccum hose. Some people have also just used a large nail through the butterfly valve to hold it continuously open. It sounds much more aggressive.

In my F21 M135i ist is not vacuum controlled it is electrical, pulling the cable forces it to stay open. Found something in DME-Module will try to edit it

Originally Posted by bmwessen

In my F21 M135i ist is not vacuum controlled it is electrical, pulling the cable forces it to stay open. Found something in DME-Module will try to edit it

Let us know if progress is made!

Regards