new individual amp cost appros 1300 USD at ecstuning(1000 with discount)
https://www.ecstuning.com/b-genuine-...d/65127842130/
used go on ebay for 300-500 usd
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E81 2007 130i 6cylinder Montego blue
Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.