I have a 2000 41'Express with Cat's. The exhaust exits above/at the waterline on the side of the boat. Mine doesn't have a lift muffler or anything except straight pipes going downhill to the exits.
No known problems with water backup on my setup.
The following 1 user Likes Sans Peur's post:1 user Likes Sans Peur's post janste2018 (01-26-2020)