I don't know to much about The inboard setups when it comes to mufflers as I have always been a sport boat nut with through hull exhaust. The more I look at this setup the more questions I have. A mock up of mine has the muffler lower on the engine side than it is at the aft end. (Seems it should be lower on the rear) It is also not centered very well (a few inches favoring port) What happens in the winter when below freezing? There isn't a drain on this thing, maybe I should add one. As far as being able to get it in without pulling the floor up I would think you would have to be real lucky. I have fuel tanks out as I an replacing them along with the floor and its still a pain to see whats going on as far as support under the muff. You maybe better off to start after the fishing season ends. I have a 350 going in that will be about 315 or 320HP. Hope to be pretty fuel efficient.
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