Ghost BMW Underseat Subwoofer Upgrades (100 Day Trial) – Bavsound
Getting More Bass in my BMW M2! (Bavsound Ghost Subwoofer Install & Review) - YouTube
Bavsound - Take a look at our new, sexy redesigned Ghost Subwoofers (V2)! Over 100% more output than your factory subs and another 11% increase over our V1 Ghost subs. You'll get