hey, guy's I'm new to this site. glad i found it. I just bought my first banshee sold the snowmobile for it anyways i tore it down to the frame and redid it my way did some small mods reeds,30mm carbs bored 10 over with prolite's fmf gnarly k&n clamp on.went with plus 4 on timing runs great but i have been reading about a shift star not sure what that is or what it does for you just looking for some input thanks