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Old 07-01-2009, 01:32 PM
Jax_F150 Jax_F150 is offline
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Join Date: Oct 2008
Posts: 7
Normal.

When a Catalyst converts carbon monoxide to carbon dioxode, the by-product is water.

When the exhaust is hot, this water travels out as steam/vapor (which is why there is little carbon in modern exhausts as this steam cleans it out).

The water you see coming out is usually at idle or at startup when the exhaust is cool enough that the water is not turned to vapor. This is especially true at startup when you will blow out all the water buildup from the last run as the exhaust cools.

BTW - this is why all stock modern exhaust are some form of stainless - they all have condensation buildup that will rust out a non-stainless system fairly quickly.

Last edited by Jax_F150; 07-02-2009 at 09:24 AM.
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