2009 JK water from tail pipe and muffler.

[Jeepin721]

Does anyone know why there is so much water expelled through the exhaust system on the jeep JK's?

 

[Kiel]

condensation from it starting to get cold

 

[STAG]

I've always heard that if you are getting water condensation through your exhaust it means your engine is running good and efficiently. Who knows if it's an old mechanics tale or not.

 

[jeeper]

It's the job of your catalytic converter to reduce your emissions to a water substance

 

[TurboMinivan]

It's the job of your catalytic converter to reduce your emissions to a water substance

This. Or, to put it another way, water is a product of the catalytic process. This is why modern OEM mufflers have a small drain hole in them--to allow this water to escape and thus significantly increase the lifespan of the muffler before it rusts.