Why is the exhaust spitting?

[MoparCarGuy]

FWIW the exhaust condensation mixes with the carbon soot in the exhaust system and creates carbonic acid. The acid then destroys the exhaust components. A rich-running engine makes even more carbon which deposits itself on your E-Body's rear valance and bumper. Consider a tune-up with an exhaust gas O2 sensor to check for a rich mixture.
And, as everyone agrees, always warm up and drive the car to dry out any condensate!

[Scooter]

^^ Yup, looks like she is running a lil fat.