overpower bad idea?

I got a pheonix gold qx4150 4 channel amp that will bridge to 150 rms x 2 .

i have a set of boston RC51 5.25s that are 50 w rms 200 max.

90 % of the time the system is cranked, would this be a bad idea to give them 150 rms each.

Are the bostons underrated at all?

Thanx for the reply. I figured that it was but i was hoping the bostons were underrated.

Oh well Gives me a reason to go spend some money hehe