E46 Exhaust Flap?

[Sphinx]

Hi, take a look at the pic below :

http://img.photobucket.com/albums/v638/digidick/attachment.jpg

Does anyone know what the exhaust flap on the right tail pipe is for ...

and which models it is installed on?

Cheers.

[paul46rider]

i think it opens at higher revs.

[danch]

Yep,
It stays closed on starting the car to quieten the exhaust note and opens up as the car heats up :D

A lot of people on the e46fanatics disconnect the tube.

Cheers

Daniel

[Sphinx]

Do all models have these flaps?

Or is it limitied to Manual or Auto's only?

[Chaos]

Actually it's mainly to provide the required back-pressure at lower revs. It opens up at around 3k revs, give-or-take, and closes again as you slow back down, the exception being a full throttle at which point it opens up to allow the extra load on the engine plenty of room to escape ;). A lot of people fiddle with it so it stays open, but these are often the people who post a few days later about how lumpy their tickover is. :D

AFAIK it has nothing to do with whether the car is a manual or auto, and I'm not 100% sure about it but I think every twin-pipe model runs one (although I don't seem to remember it on mine but then I never looked that hard :p).

[JazzMan]

320Ci's with the M54 dont have them, only the 325 and 330 do :)

[Stock323iSaloon]

320Ci's with the M54 dont have them, only the 325 and 330 do :)

M52's also have them, well I have them too :p

[JazzMan]

M52's also have them, well I have them too :p:D

I want a flappy thing on mine, i feel kinda left out now :D ;)