I LOVE the look of this setup but it doesn't seem very safe? I'm guessing the coupling about 12" from the tip would be a flapper? But when the engines are shut down wouldn't there be water sitting on top of the flapper which would eventually get past it and into the engine? Is there something to this setup that I'm just not seeing or Is it a REALLY SICK part of closed cooling type system?

It looks like a completely dry exhaust... no water ever gets in the tailpipes (unless maybe some rain if it wasn't plugged)

No water comes out the tips. The water that circulates goes into the fitting and hose at the endo the pipes and gets dumped through the hull at another location.

Gotcha...Im really interested in building a setup like this for my boat. Are the headers on these setups usually double walled and cooled as well?

They are double walled with water circulating in between. The only difference is that instead of water mixing with the exhaust gases, it goes out the dump hose. They are considered dry pipes and they are VERY VERY LOUD!!!!!!!!

Is this why some of the outerlimits have like 6 streams of water coming out the back while they are running? XXX for example. One for each header, and one for the intercooler.

Yes, they dump huge amounts of water when running.

Interesting....So, Does the cooling in the risers alone pull the heat away from the headers or does the header itself get cooled as well? Any of you guys have any pics of a setup like this with the hatch down?

The water completely encases the headers and pipes, injected below the headers, runs up the pipes, and then out the dumps. They are way loud and a huge help with big cams that would normally have reversion issues.

everything is double jacketed, tube with in a tube, that is why they cost$5000 and up.