Not Mopar specific, but even if you run them under the car you will most likely have to run turnouts to keep the fumes out of the car. most everyone i know including myself run turnouts. My car was so bad a person would literly get sick from the fumes on the shut down and driving back to the pits, before i installed turnouts, i'm also injected. I wouldn't worry about the moisture, the exhaust come out so hot there's just not that much moisture.
JMO
Zip.