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I would expect your car to have a 4 channel amp in the front trunk. If that is the case, two channels drive the dash speakers and two drive the door speakers. You would not have the option of hooking up the rear speakers to the four channel amp.
I bought a 6-channel amp from a 911 cabriolet. That gave me the option of hooking up the rear speakers to an amp. They sound slightly better run off the amp than from the head unit, but it is not a huge improvement. The cost was negligible (I think I paid $40 for the 6 channel amp) so it was worth it to me. A better investment is to improve the dash speakers.
Good luck
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