I'm considering buying this flush system from www.marinetechgroup.com (maybe iboats carries it) which would allow me to run fresh water through the engine (which has fresh water cooling) and also can be set to run fresh water through the outdrive. It can also be set to run as a backup bilge pump. I keep the boat moored in salt water and the engine and outdrive currently only get rinsed out at the annual haul out. For about $75 it could be money well spent if it makes the manifolds, risers and fresh water cooling system last a little longer. Has anyone installed one of these in an I/O and has it been worth the time and money?