Originally Posted by
ADRONICUS
If your catalytic converter is working well, condensation will be visible from the tailpipe exit and will actually form a drip. Where is your leak visible from?
Water is a natural byproduct of combustion from the engine, not the catalytic converter. NOx is broken down into nitrogen and oxygen and carbon monoxide into carbon dioxide and oxygen by the catalytic elements. Water is not a byproduct of these reactions.
It sounds to me like normal condensation that has built up inside the piping.