I would get (2)8w7 from JLAudio, There small and tight and you can use a smaller box. These will hit better then (2) 10" when powered with rec: wattage.
BTW, I hop your not goin gto mount the crossovers of those's Q series speakers in the doors, It would be a bad idea. mount them in the hatch with a custom enclosure with the subs.
http://www.jlaudio.com/subwoofers/w7preview.html
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