Listen, on a jet boat I will concede that the advantage of having a tunnel is pretty slight. With a prop it’s a game changer. I’ve owned 5 prop tunnels, 4 of I built myself. A flat bottom boat over around 60 hp has to have one as far as I’m concerned, at least for the areas where I hunt and fish around the Arkansas River. I don’t like a tunnel with a 25, you can jack those lightweight little dudes way up on the tea some and cheat. When you get into a big motor with a big prop, skeg, and heavy load the tunnel keeps you from having to get out and push the boat. I’ve ramped more beaverdams with a 150efi and 200 carbed Merc than I can count. Only thing that runs the shallows with a load (mud motors don’t handle them well) is an airboat. I’ve owned 3 of them as well -2 of which I built. They are fun -and absolutely obnoxious...