I'm looking at turbo kits online for my gsr hatch. I was wondering if someone can explain what a/r and exhaust #'s translate into in very simple terms so i can understand them. I know they have something to do with the turbo's power capabitlies but that is where my knowledge ends. For example i saw a t-70 turbo with .70 a/r and .84 exhaust. What does all this mean? thanks!!!!