Well, first of all, I would strongly recommend replacing the 5 1/4's with 6 1/2's in the doors (not hard to do). Second, unless you shop for a good 3-way system, you're likely better off with a good 2-way system. I would consider MB Quart, Hertz (if you want some REALLY good stuff), Dynaudio (also excellent) and I'm sure there are others that aren't coming to mind.
If you want to really complete the project, adding a small sub to these cars yields a significant improvement in overall sound.
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Boxster S
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