I was helping a friend put in a CAI this weekend, after it was done we went out on a test drive. When we returned we could hear a hissing sound when the car was off, it sounded like fluid leaking onto something hot. Looking under the car there is a little puddle under the car near the passanger side floorboard, can't tell what the fluid is. Not oil but I was wondering if someone knew what this could be? Could save us alot of time.

 

It's called water, or condensation.

 

also known as H2O

 

wateris all it is, like they said. the hot surface it's hitting is his exhaust manifold. causes the manifold to crack in a lot of cases.