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most stock speakers (unless they are part of a premium package like a bose or infinty or something) are high efficiency speakers with relatively low power ratings. An aftermarket head unit that says 45W X 4, is typically around 20W RMS ... which is easily enough power to blow a set of factory speakers. And as stated before, the power is NOT linear - most of the power is being put out by the unit at like 1/2 to 2/3 of the volume. So if you're volume control is 1 - 50, by the time you hit 30-35, you are probably already putting out 18 of those 22 watts.
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