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Need a cost effective audio upgrade. Please advise. The stock base system is terrible(doesn't come with tweeters or amp). : r/F30
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BMW F30 Harman Kardon Speaker Upgrade – EZtuning
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BMW F30/F31/F34/F80 Speaker Upgrade with Harman Kardon – Bavsound
Harman Kardon Retrofit - BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
