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BMW sells an Alpine amp & speaker (HK) upgrade kit. I think its like 330 euros for an Alpine amp, wiring harness and four speakers. They even give you tweeters for the mirror triangles. Although you need to order the trim extra to mount them if you don't have teh upgraded audio sys. By all accounts it gives you decent sound.
I think you will most likely need to spend atleast 1,500 euros for better sound than the BMW kit.
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