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Review: Earthquake SWS-8xi (2-ohm) and Rockford Fosgate P300-2 - BMW M3 Forum (E90 E92)
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Earthquake SWS-8X Sub Install for F10's - M5POST - BMW M5 Forum
Earthquake Sound - SWS-8X - Earthquake Shallow Subwoofer - (NO LONGER AVAILABLE)
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