Re: through hull exaust
With through hull exhaust you have alot of choices . You can go straight exhaust, which is louder, but you still get some silencing from the cooling water which is pumped in just after the riser. Not much mind you, but some. The drawback is that the exhaust note could be a little loud for what you want, especially if you have other people on board, and are trying to have a conversation. With this setup, you also could annoy other fellow boaters, when coming into a marina or mooring, who are lounging about on there boats trying to enjoy some relaxation and peace and quiet.
The other option is to fit mufflers on the exhaust. This takes the harsh edge off of the exhaust sound and actually produces a more mellow tone. Thee are a number of producers of marine mufflers out there. Here's one,
www.vetus.com
The amount of silencing is up to you, or just go through the hub. Personally, I love the sound of through hull. If its set up and installed correctly, you can still get that sweet rumble without pissing people off