[cstavaru]

Hi,

Yesterday, when reversing and climbing an obstacle very slowly (with clutch help) I just noticed a very high pitched metallic sound coming from the BMW Performance Exhaust at the same time with the normal sound. After climbing the obstacle, I accelerated in neutral a few times and the sound was gone. Today I noticed the same thing when parking and climbing the same obstacle.

What could it be ? Could it be normal ? Could it be a loose clamp or something inside the muffler ? Or maybe the vacuum-actuated flap-opening mechanism (which is still present in the Euro-version of the exaust) ? I remember the flap-open does about the same sound for a small fraction of a second when it opens...

I can't hear anything when driving normally, even with the window down...

Any ideas ?

[mmm def]

was your car cold/just started? Exhausts will sound differently until warmed up.

[cstavaru]

Originally Posted by mmm def

was your car cold/just started? Exhausts will sound differently until warmed up.

No, I was just parking the car after driving for about half an hour.