You could easily add a drain at the 45 degree elbow there at the bottom of the "stack"...by the antenna. You'd have to find a way to keep mud from coming in through the drain though. Maybe drain it into the engine bay...or a covered area in the fenderwell. Just an idea.
I have a sewer pipe fenderwell intake on my 1999 Grand Prix and I know a guy that ran his GTP into the low 13s with a PVC fenderwell. Can't beat the price

My dad has one on his Intrepid as well. [8D]