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Purchase BMW E39 M5 540i 530i 528i 52i5 DSP HIFI NOKIA OEM Subwoofer Sub Box in El Cajon, California, US, for US $34.99
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Sharing audio upgrade on my non-DSP in '99 528iT. Kept OEM headunit/cassette (for looks mostly). Replaced stock speakers with Bavsounds & replaced OEM CD changer with GROM bluetooth which punches above its
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