Here's maybe a "heads up" for you.  I had my '08 Elantra down to my dealer
today for an oil change and tire rotation.  While walking around waiting for
my car to be done I saw two front end sub-frames leaning against the outside
of the building.  Both were almost completely rusted thru in the same exact
spot.  The service manager was walking by and I asked him what model Hyundai
they came off of and he said they were from Sonata's.  Evidentally the
factory forgot to put a drain hole on that one side (passenger side I
believe).  These frames were so bad I would not want to have been driving
the car they came from and hit a major pot hole.  Looks to me like they
would have snapped in two.  The manager said they were just about to start a
recall.  Unfortunately I forgot to ask him what year models were involved.
If you have a Sonata I suggest you crawl underneath and check the front
subframe in the area of the upper and lower control arms.