I found strange sound on 'Center Silencer' then after check it,
there is leaking on the part of welded.(so tiny makes little noise)
You guys think SES sign will be fixed if the silencer replaced or
weld pin hold part again?
But I wonder why the end part of those silencer and manifod direction
is different?? One(right-hand side) of two pipes end of silencer shape
is vertical but all of manifold is horizontal when I check.

Manifod
http://www.realoem.com/bmw/showparts...83&hg=11&fg=50
Silencer
http://www.realoem.com/bmw/showparts...30&hg=18&fg=10

Guess why they welded it when they replace silencer.