Centek Mufflers for SN2001?

I discovered one of the mufflers on our 87 2001 is very poor condition and leaking, it looks like it must have froze and broke at some point. I would like to replace both mufflers and the hoses. I found ski boat specific mufflers from Centek that look like they will work, but their website states for above-waterline applications only. Are these the proper mufflers to order or do I need to find a set specifically for below waterline applications? I noticed the units for sale by Skidim.com look like the Centek units, but they state for below waterline use. Hoping to get some clarification before spending the money.

Here is the Centek muffler: https://www.centekmarine.com/products/3-x-3-verna-ski-4-34-x-39-50/

Interesting their fiberglass elbows do not say ‘above’ waterline.   Excelllent opportunity to delete mufflers. Put money into one piece new flex exhaust tube.

Putting in a full length section of corrugated hose would be easy, but I think it would add a substantial amount of noise. The family and lake neighbors probably wouldn't appreciate it. Too bad the hose cost so much or I would give it a try in the event it's not much louder.

I recently saw I member selling a setup on this forum to convert. I sure understand quite, some of the Harley’s are ridiculous. Only you know your family and lake.