I got a 2014 Lowe Stinger with a 115 4-stroke. My speedometer on the boat says 47ish......but my GPS on my Helix says 39mph and thats with all my gear and hopefully both livewells full of water and fish! I trust my Helix way more than my Boat spedometer. If ur wanting speeds over 50mph you may have to go with a much bigger motor than 115hp. More like a 150+. I was told by the dealer that mine would exceed 50. I wish I would have made him bet his life savings on it....cuz he did not tell the truth! Hahahaha