Beautiful boat! I have a 1991 Carrera with a 496 chevy, Bassett thru transom headers and 4 inch tips. It flows just about as good as the ot's with less noise.If you have Supertrapps , you may get away with it on some lakes .Generally ,new law is you need to go through transom.We got rid of the Bassetts on this Carrera and put Glenwood logs through transom. Boat is used here in Vancouver area and in Kelowna no problem.
Just for your info , didn't loose a single RPM with the swap
because it's a relatively mild engine with 415 HP .