The Coffman's exhaust has a water jacket. It's actually a pipe within a pipe. Normally water injection would be used for boost or added at the stinger but perhaps it's just to cool the walls of the pipe in this instance.
They have tapped the pump so they have twice as much water going in that's for sure. If it were in my town I'd probably snag it and have a look first hand ha-ha
I'm sure the OCOD-SPIM-NAMMER trucking company can arrange logistics............