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I had the choice between an ETEC 90 and an ETEC 115 because the dealer had the 115 in stock and had to order the 90. I was worried about over powering the rating of a 1978 Montauk but was thinking about the 90 HO. I went ahead with the regular 90 and must say it has PLENTY of power. The first prop I tried was a SOLAS 15 which was way too under pitched. It would, however, leave the water, literally. It would jump on plane in under 2 seconds but I would have to back off the throttle as it would easily overrev. I went up to a 19 stilletto which put the boat at 44-45 before I installed a bow mount trolling motor and battery in the console. After the trolling motor/battery, it will go 41-42 with 1 person and 40 with 3 people ice and gear. The boat still planes in less than 3 seconds boat doesn't come completely out of the water which was causing the prop to catch air. I only have the motor mounted 2 holes up and it still hits 5500 rpm with 3 people so I could probably still add some pitch but decided not to for watersports purposes. I did not like the boat at 44-45, to floaty feeling. These hulls are not built for running over 45 in my opinion. 40 is fine for me and I cruise at 30 mph running 4000 rpms sipping fuel like my old 9.9 on a 12 foot bateau, no kidding. The 90 HO and 115 require an external oil tank and would likely burn at least a little more fuel. All of this made me happy that I went with the regular 90. I dont think I would have ever used the extra power of the 115 which they offered to me for only $400 more than the regular 90.