It appears that there's a crack in the exhaust manifold on my wife's 190-E 2.3.
Is this a problem?
Can it cause problems?
Can it be fixed (e.g. welded)?
Is this a tough job to replace (doesn't look like it)?

Thanks in advance (TIA) for the help / encouragement.

__________________
Jay Yambrovich
Scotts Valley, CA.

1993 300 CE Cabriolet (A124) 131K miles
1997 C-280 133K miles

2000 BMW R1100RT 69K miles
1989 300 E 216K miles (sold)