I am getting into racing these 3 cylinder m40d's and through my failed attempts at finding answers, I felt the need to check with some of you who may have experience with the subject. Other than the stock 1.85? and the 1.1 ratios, is there any other options to change my ratio? I would like a 1.65 to a 1.7 if possible. What other motors have gears or lower units compatible with a M40D? Any help would be much appreciated.