If you want the best pre-cleaner, get one with an exhaust ejector.    Donaldson is my first choice.   http://www.donaldson.com/en/engine/support/datalibrary/074396.pdf        The Turbo II will help, but watch out for the pre-cleaners that dump the dirt right above the intake.  They will suck much of the pre-cleaned dirt right back into the air cleaner if the vehicle is not moving fast enough to blow it away.  That is a stupid application for any slow moving vehicle. The original Turbo pre-cleaner did that, and I am disappointed that Donaldson recently introduced a few pre-cleaners like that.

Donaldson has dealers almost everywhere.