I was given a removable nosecone to try on my motor which is on a 2002 TR20. It goes over the bullet of my lower unit and uses 2 screws that screw into where the intake screen is supposed to be. I have to remove the screen for the screws, but this nosecone has lower water pick ups, and inside the nosecone itself has ridges from the lower water intake that act as channels to the water intake on the lower unit. He used this on his 200 Merc, and he said that it should be compatible with my Yamaha lower unit. With a 25M Yamaha prop, I was running 73gps by myself, 1/2 tank of gas @ 5850-5900rpm's, and with 2 people running 70gps, same amount of gas @ just about the same rpm's give or take 100rpm's. I was at 20#s of water pressure at 2.5inches below pad too. Has anyone ever seen one of these nosecones, used one, and know if it will work on my Yamaha? Any performance gains?