I just don't understand why engineers don't try and always incorporate the best of whats out there...case in point the sea water pump......now in HIGH HP applications where they could possibly need more water then a standard pump they have their use....but for everyday stock use why didn't they just adapt the way the cobras had/have their impellers mounted in the back of the drive??? I mean come on! It cant possibly get ANY easeir then that! And if you haven't changed an impeller on a cobra look here:
https://www.youtube.com/watch?v=pH6dNUXKJ6o

you can sit on the swim platform in 100 feet of water and do that pump...