I have 2006 42 fountain running standard bravo xr bottoms and wounding if there would be advantage going to sport master or imco drive bottoms at same drive heights? Boat has 600hp engines and my best speed so far was 90 mph. Some guys tell me its not worth the change but others say I will gain some on big end...

You will instantly be the center of attention at any party, your suitcase gut will become a 6-pack, and world leaders will seek your wisdom. Isn't that enough reason to do it?

That's a good enough reason Rob!! It's only 10 screams. That's nothing in boating world right....