Try the exhaust turn downs outside the hull before the muffler deal. I removed the flappers and put on 45 degree units and pointed it under water while running slow.
This was a huge improvment and I never isntalled mufflers after that.
At WOT the turn down are above water sot here is no restriction.
Check out fish the classi for lots of ideas on making yours managable.
A lot of people end of putting sound deadoning inside the engine cover as well.
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Glen
1996 23ft Contender 08 Yamaha 250 HPDI
1965 13ft Cacci craft skiff with 20 Hp tohatsu 4 stroke
1992 20ft Shamrock Predator (Hard Top) 351 FWC PCM Repower SOLD
First boat: 1988 17Ft Shamrock Open 3.0 Mercruiser RWC 140hp Traded
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