quick question: I'm going to change the upper pulley from a 2.93 to a 2.81 on my stage 3 blower. Question is will I need an idler, or will I be ok without one. Preferabally I would not like to have one, trying to look as stock as possible, but if I do which one, and what size belt? Also what size belt without the idler? Thanks for the help guys :beer: