Well after a long search for the cause of my coolant flooding out my overflow bottle, Ive finally fixed it. I replaced alot of parts before with just off-brand (stant) products, and the problem persisted. Well I finally got my order in from mazdatrix, and got an OEM radiator cap and thermostat (and a cool new rubber antenna ), and viola!!, no more coolant leak! . Turns out that was all that was wrong, a bad cap and/or thermostat. Im so happy! Moral of this story, always buy OEM Mazda parts for the coolant system, it will save you alot of headaches!