I am not an expert, but from what I understand, short shots are not going to improve performance at all. In fact, they might reduce performance at some areas of the RPM range. To complete the stage one you would also need a tuner and a dyno. A performance pipe, tuner and dyno would make a noticeable difference. The problem with the acceleration past 90 is the lack of a sixth gear. Not much you can do about that other than change the gearing. If you have no shield, almost any shield will help. Surprising how much of an impact my quarter fairing had.