Fitted two new C18's into one of our Catamarans based in Dongara a few years back the C18's were only rated @ 875 Hp, we passed all the water out the exhaust but used 10" pipes and custom pong boxes made in Sydney from GRP from a specialist exhaust guy, your pictures of the Pong box look way to small for 800+ Hp, the back pressures in our water cooled systems were fine and the rubber sections never went over 130 degree's, most of the new exhaust temp alarms are set at at approx the 150 degree mark (give or take),
Below couple of pictures to give you an idea of how big the Pong box should be
Cheers Steve
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