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Have you checked the rating on those PNP's? I have them too, which are the ones sold for the speaker box ... I don't know if they're rated for the amount of wattage your amp is running considering the factory amp is 50 watts per channel. Your 300 will drive them at 75 w.p.c.
Now I have no experience with having larger speakers put in the doors, but I've read online that larger speakers require custom fabrication of grills, carpeting, etc. You may want to check with a shop who does this sort of things on 996's and 986's like the one that BigIslandBoxster posted for me on a different thread. Do a search on his screen name and you'll find it.
One thing I never thought of when I replaced my head unit was how loud the rear speakers become when used with an aftermarket system. Evidently, in the Becker head unit the rear speakers don't get nearly the wattage that the front and door speakers receive. I make this comment because I have mine set to 85% front, 15% rear now and it was 60% forward and 40% forward before. Just something to think about.
Hope this helps!
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