I have a 17.5 foot open bow with a 90hp outboard. It is a little under-powered and these help it get up on plane faster. Seems to ride a little smoother also.
I have 5 of them (10/22's). One was my first rifle. Got it almost 17 years ago. By far my favorite gun to shoot. I have Marlin, Remington, and Winchester semi autos. The Rugers are by far my favorite.
And the tube bumpers put back on, those things rock!!!! By the way the navy uses weldable (cast) corners on their warships so they must be OK. One of my trucks had blocks in the rear from the factory, Did they F- up? Great build for the money.