A quick DIY question... I'm going from an Alpha 1 Gen 1 into a Gen 2 outdrive. Since I don't know when the impeller was last changed, I got a repair kit and was surprised at how big the Gen 2 impeller was compared to the Gen 1. So that begs a couple questions... 1) Does the Gen 2 move more water through the engine because of its size? 2) Does the "every other year" rule of thumb still apply? Thanks guys!