my buddy is having this done on his 2013 cougar ftd soon. why i ask? upper edge i suppose.maybe.or not.he does like to cross sand bars to get there.WERE GOING PLACES NOW!!
He will know if he gained anything as long as he does nothing besides the hull speed. Dont raise or lower the engine, drop gear out, change a prop or anything! Keep the rig exactly the same to determine results both before and after.