I have an 06 190 T-top with a 115 Yamaha 4 stroke and my top speed has dropped from almost 40 to about 35. The engine has 90 hours on it and seems to be propped right since WOT is dead on @ 6000 RPM so I'm thinking maybe its time for the inner hull drain. The boat is light-only one battery and minimal extras but when I'm alone the boat feels "bow heavy" and at WOT she seems to be plowing: even when trimmed as high as possible. Putershark highly recommends an inner hull drain so I think I should give that a try. I'm mechanical and I have the tools and I'd prefer to install it myself but whats involved? How deep do I drill? When I've bored deep enough I simply hollow out a pocket for the water to collect? Dick at Merrit said he installs them at the same height as the 2 factory drains so that's clear. Appreciate an advice-Thanks!