The way this exhaust is set up is definitely NOT OEM and NOT safe to have in a closed engine hatch environment. With no heat shielding I am shocked there are not charred or melted things from the infared head off those elbows. Unless the entire system was heavily wrapped before these pics were taken, this is an imminent fire risk. Even if they are wrapped, the heat introduced into the ambient engine compartment air will be terrible for horsepower. Our blower motors on the dyno glow dry headers orange all the way through the collectors.
It looks like some car guys put on stellings jacketed headers when doing some engine work and then made a Y pipe setup to adapt the headers to the original exhaust. The way is needs to be done is at least the first elbow, plus six inches needs to be jacketed, then you can dump the water into the exhaust gasses from the top half of the jacket. if you dump the water right at the header collector, then there will be major reversion issues, even to the point of hydraulic-ing. The whole system would need to be custom built one off.
I have to ask another question: after the Y pipe tail contraption, where does the exhaust actually exit the boat. Is it a single through transom down low, or does it exit at the stock through gimbal and hub setup? If it is not a straight through transom exit, you might as well put stock manifolds on as the system will just bottleneck in the gimbal.
JT
