Im debating between spool or posi. I drive on the street a lot, but the car runs mid 10's right now. I like the durability of the spool with 33 spline axles, but it isn't as practicle as a posi with 30 spline axles for street driving. I know the spool would eat up tires too. How fast are you posi guys going? Hope you 10 sec guys can jump in here....