The first place to look would probably be the seams around the catalytic converters, then follow the pipes up to the exhaust manifold. Of course a rust hole should be found or maybe even a rubber grommet that has been knocked out of whack.

Phil Forrest

__________________
1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson