I dont know REAL power ratings, but it cant be much. Look at the speakers and it will tell you. They are typical OEM type crappy paper cones, cheap foam surrounds, and dainty magnets.
Also, OEM specs are always rediculous. I mean REDICULOUS. From the nissan website:
Base stereo: 160-watt audio system with AM/FM/CD
Bose stereo: 240-watt Digital Bose® audio system with AM/FM/in-dash 6-CD changer
I call bullshit on those specs even being MAX power output. That is saying the Base stereo is putting out 40watts max per speaker. This is a straight lie. Even the highest quality aftermarket head units dont put out that.
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