I really think you will be a lot happier with a good, modern set of component speakers for the front. The BMW stuff was pretty poor and has only gotten worse with age.
If you're comfortable cutting metal, you can get 6.5" speakers in the kick panels with good tweeters in the doors.
I'm not a big fan of the clunky add-on look of aftermarket rear speakers, plus they take up valuable room for the seat-backs, especially if you have installed the seat-tilt mod and removed the two rear humps.
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