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Unfortunately, there's plenty that prevents you from easily doing this. I didn't think any US Spec cars came without door speakers, but if that's the case, the only viable way to change that is to get new door panels. Now, regarding the CDR23 in an 03 or newer car: your head unit to amp connection is optical, via what Porsche calls the MOST bus. You cannot install an aftermarket amp if you want to keep the factory head unit. Further, if your car really didn't come with door speakers, your amp doesn't have enough channels to drive them in the first place.
With respect to the speakers, the factory stuff uses a bit of a weird impedance, so while you could install aftermarket drivers, the amp may not be happy driving them (keep in mind the factory amp is horrendously underpowered in the first place).
Unfortunately with these cars, audio upgrades are pretty much an all or nothing type deal. That said, you can do a whole aftermarket setup for fairly reasonable money, that will sound WORLDS better than what you have now.
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Boxster S
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