Pat McPherson

Guys,
Eddie Marine has a number of Muffler tips available for $300 to $700.
I talked to them two weeks ago. They have mufflers designed around California Laws for the HP525 with no power loss...
I will probably upgrade mine to their Big Gun if I have losses with my current tips.

krakmeup

Thanks for all the good input guys. OHZONE it sounds like you have a great idea with the straight cut tips - that's prob what I will switch out to, and add the external flaps also. Then if later I actually need muffsI can add something easily.

Pat McPherson

Personally I don't like the clamp on style mufflers; they get long and can fall off. If I need to upgrade from the muffler inserts, I will buy new tips with the muffler integral. There are more and more choices for reasonable $$ these days.
Like OH-Zone suggests, I run with both internal and external flappers...
My cousin lost and engine while beached...
One of his flappers had burned off and a boat wake splashed up the exhaust into the engine...