bmw 318d 2007

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    BMW 318D 2007 Speaker Upgrade

    BMW 318D 2007 E90. Hello! I get a bit lost when it comes to audio and cars. I'm pretty technical with everything else but wanted some advice. Just bought this car, it has 2 front door speakers 4" and 2 in the back shelf which look to be about 3" (no tweeters) but there is room under the grill...