It doesn't seem rusty at that point.  It looks like a stress crack on the lower 
side which should be plainly visible to anyone who cares to look.
It's an ansa muffler on a Fiat X1/9.
http://www.italiancarparts.com/exhaust/Ansa.html
Oh Yikes!  This site has $95 shipping and then there'd be duty and taxes . . . 
And, it is running fairly poorly.
Thanks!
> From: John Caffrey <jdc6@Lehigh.EDU>
> 
> Hi Robert,
> Your vehicle should not have raw gasoline in the muffler, but you would 
> know if that's a possibility. It would have to be running very poorly. 
> If the split is due to rust it could be difficult. You end up burning 
> through the thinner metal and chasing the keyhole around until you get 
> to better metal. You are not allowed to weld on an exhaust system in my 
> state, but a clean repair can be disguised. What make of car has a $500 
> muffler?
> John
> Fogelsville, PA
> 
> Robert Duquette wrote:
> 
> >Hi there!
> >
> >What kind of trouble could a person get himself into by attempting to 
>stretch a $500+ muffler past a safety check by welding a split in the muffler 
>itself.  It wouldn't explode due to uncombusted fumes or anything like that 
>would it?  The metal looks claen enough but there appears to be a stress crack.
> >
> >Poor boy
> >Robert D
 
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