Outrageous -- After reading your post about your muffler I took a closer look at mine. The inlet's definitely have a slight upward slope to them which I had not noticed upon initial inspection. This would place the exhaust outlet on top. I really appreciate your input. Now the question is if I will get lucky and have the space to slide the muffler in place without having to pull the rear deck.
My boat has a tired 454 crusader in it that I will replace when the funds become available. I cruise generally around 20- 22 knots and I suspect I get around 1mpg as 454's were not designed with fuel economy in mind. If I were to repower I would replace it with a 350 as the inboards with this motor combo seem to cruise at the same speed with better economy. If you want to go faster you need to go diesel and the yanmar powered boats cruise around 25 knots or higher.
CT -- Thanks for your input. The shamrock bilge is huge compared to the space available in the seacraft. I don't know if there is even enough space to fit two mufflers inside. My current exhaust is Y'd into a single 4" exhaust as it is. Other inboard seacrafts have used this muffler setup throughout their lifespan ( over 30 years now) and this leads me to think that the setup probably works out ok.
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