Thanks for the replies guys, I'll check out those two sites you mentioned.
midlife_crisis, good point about the owners forums, however my boat is a 1994 Celebrity Status 240. Celebrity is no longer manufactured but there are several in the midwest and I've seen many with the thru-hull exhaust, though never close-up. It does have an integrated swim platform, but as stated above, I've seen several of the same mold so I know it can be done. Just not sure what it takes. Not sure on the risers as I don't know what they are, but I'm on a quest to learn.
Extreme1, noise ordinance is why I want the selectable exhaust like Captain's Choice or Corsa's Quick and Quiet. There is no such ordinance where I boat now but you never know. I want to have the choice if something were to change in my area or if I take the boat to an area where such and ordinance does exist.