Saw this under my truck and saw a clear puddle but it has stopped. .does anyone know what this may be??

 

Every exhaust system develops condensation on a cold startup. Usually you only see it on the muffler and the tail pipe. This indicates a pinhole in the flange weld or a bad gasket and can be repaired easily or just left alone. Some guys even drill a 1/16" hole in low spots to help keep the exhaust drained, especially if you drive short distances and shut it down.

 

Ok thank you it is also smelling weird when I first start it. I did just replace my factory battery with a new one and got a new air filter prorated to all of this