They have been the only exhaust makers that will make the risers the way they need to be in my boat and others with my style boat have used his exhaust with great success in eliminating the water reversion that haunts these engines. The Volvo riser and manifold design is just terrible. The raw water exits like a waterfall over top the exhaust for cooling purpuses but while doing this the exhaust pulses pull mist back into the exhaust runners. And since the water exits about 8" away from the center of the exhaust manifold it equals disaster. The stainless risers he makes move the water exit about 20"-24" away and out a shower head style exit pointed down hill. So there is nothing pouring over. Plus head builds a reversion dam into the inside of the exhaust and then the hot ring to cook off condesation. It just seems like the best option. I am not trying to build a power house I just want a long lasting reliable engine. The reason for trying to glycol cool the manifolds is for the obvious, so I wouldn't ever have to replace them.

Help plz
 

I have 73 searay mercruiser the exhaust plate is not there can I still drive the boat without that plate