B58 MPE (M Performance Exhaust) How are the valves controlled?

[doublespaces]

I came across this system for the 340i/440i again and decided to take a closer look. I don't see any vacuum nipples and I think the stock exhaust uses an electronic valve, so I assume these are electronic as well? I'm interested in this design for a custom exhaust of my own.

 

[ryanmamikel]

They use electric valves now, the Black almost square things are a solenoid/motor that turns the valve to position.

A similar setup is used in the f80/82 m-perf exhaust as well.

 

[doublespaces]

They use electric valves now, the Black almost square things are a solenoid/motor that turns the valve to position.

A similar setup is used in the f80/82 m-perf exhaust as well.

Thanks for confirming this. Now, the next question is, are these more reliable than the QTP cutouts? If so, I wonder if its better to go with an OEM valve like this.

 

[ryanmamikel]

Thanks for confirming this. Now, the next question is, are these more reliable than the QTP cutouts? If so, I wonder if its better to go with an OEM valve like this.

I was honestly thinking of doing some thing quite similar, as we have a few mufflers around my work with the valves and the motors on them from accident cars. Just, not a priority at the moment. They do have a 4 pin wiring connection on them, so I am not sure if it just a simple on off, because the extra pins make me think there is some sort of position sensor in them, and possibly a 5v reference feed. Either way, I am sure they can be made to work with a toggle or possibly a potentiometer, and you can control the "noise".

 

[doublespaces]

So, when the valves are open, this is more or less a straight pipe exhaust?

 

[ryanmamikel]

Correct. You will still get some sound waves isolated, as the paths to the muffler are not completely closed, but the exhaust will flow better.