If you don't push the subwoofer too hard, then no it won't hurt a thing. A speakers limits will be determined by the enclosure more than the rated RMS, which is a thermal rating for the voice coil. You will typically reach a speakers full potential with less power in most common enclosure designs. Main thing to remember is to listen to the subwoofer, if you hear excessive distortion, turn it down.
it is probably a little overated and it's probably tested off of 14.4 volts so you will be fine, take about 150watts off what they say and thats the number i would go off of from hifonics