getting several opinions of putting mufflers on twin 520 hp engines. 4" custom wet exhaust and want to settle down noise . Any suggestions...please

Sure, rotary mufflers.

Drew Marine, Shotgun silencers

I have these on my 525 and they work well. Engine sounds great but it doesn't bother those outside the boat.

http://www.hardin-marine.com/p-12619...-mufflers.aspx

CMI sound elimination mufflers

http://www.custommarine.com/accessories/Silencers.php

Here is a video of me running one of my 565hp engines on a stand with the mufflers!

No mufflers - http://www.youtube.com/watch?v=Xy-7U...e_gdata_player

Mufflers - http://www.youtube.com/watch?v=ZX0sV...e_gdata_player

Everytime I recommend Aqua Power Ltd. mufflers to boaters, I always usually hear back that they had great results and no loss of power at all. Worth checking out.

Best Regards,
Ray @ Raylar