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Well, you can get the DSP amp for under $200 from eBay. Then, you can scrounge up the three DSP plugs from either a dealer or maybe even eBay with the amp. You can probably get an X5 subwoofer box on eBay for under $100, or you could do an aftermarket powered sub like the Infiniti Basslink.
I would upgrade the main spekers too, even though it is not entirely necessary. (The DSP system does come with upgraded speakers compared to the standard system.) You could get something like Bavarian Soundwurks speakers.
All together, you could probaby piece it together for $500 - $700.
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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
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