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BMW E39 M5 - Speaker and Amplification Upgrade

BMW E39 M5 - Speaker and Amplification Upgrade
Improve the sound of the factory BMW M5 E39 Navigation Stereo Unit.
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Up amplification and tune to suit a modified front-stage, a 3-way factory speaker system.
Replace Nokia subwoofer enclosure under back shelf, with a pair of AVI sound SLS-200 8" subwoofers.