the water is most likely from condensation

my friend the other day said he had the same thing happen in a mitsu

was it loud like you had a hole in the exhaust somewhere?

like edward said the longer stop bolt wouldnt mess with the machine but
but the long idle periods could build condensation instead of blowing it out the pipe

those catalysts are covered under a 3 year warranty (by law)
there may be an hour restriction on that but i think its about 3000 hours

i would tell the operators not to let it idle so much

i dont understand why the manufacturers dont have anything in place to deal with condensation in the muffler

my brand new E350 has a small drain hole in the muffler for condensation to prevent what happened to you