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1) Window rattle when not closed all the way. Not much to do here. Either open it more or close it. I note the same rattle in my sedan. I think it's the loose edge of the window glass hitting against the trim on the door on either side of the glass. If it really bugs you, you can attempt to apply some caulk or foam tape under the metal clips that hold these trim pieces in place.
2) 6x8 or 5x7 (with a hole pattern that also fits 6x8) up front. Here are a few sites about speaker replacement in the P5:
www.protege5online.com/Tech_Help/Audio/ [break to bypass the 115-letter limit] Speakers/speakers.html
To put anything else but round speakers in the rear doors would mean cutting away metal (not recommended as this would weaken them in side impacts), unless you pick speakers that are tiny enough so that you have to add metal to mount them.
With respect to Consumer Reports, can anyone with access tell us what is says, at least the main points?
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