depends what your looking at achieving.
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If your looking for a decent sound just for your own pleasure then 2 components and 1 10" sub behind a seat will be more than enough! reason you dont need rear speakers is because the mr2 cockpit is very small and the rear speaker are VERY close to your head.
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The sound from the front speakers will reflect from the back of the car easily
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If its to show off at cruises then i do not know whats recommended or if there is even a limit!
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Im going for Hertz energy components 5.25"
Hertz 4 channel ep4 amp
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(will be bridging 2 of the channels to power the sub)
And 10" sub behind the drivers seat, I dont know what sub yet but i will post on here once i know.
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Music i listen to mainly is Rock, Drum
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& Bass and many sorts of Dubstep