Wicked C.A.S. > BMW > BMW - E90 2006-2011 10" or 12" Magic Box 4 DR SEDAN SUB BOX SUBWOOFER ENCLOSURE 325i 325 330 335 335i 335xi
BMW E90 PREMIUM BASS UPGRADE‼️(BAVSOUND GHOST BMW UNDERSEAT SUBWOOFER V2) - YouTube
CAR Sounds & more - Audio System Woofer BMW | Facebook
Car Subwoofer For Bmw F10 F30 G30 E90 Series High Quality Under Seat Low Range Frequency Loudspeaker Bass Speaker Horn Stereo - Multi-tone & Claxon Horns - AliExpress
Audison Front, Rear Speakers, and Subwoofers Bundle Compatible With 05-11 BMW 3 Series Limo/Sedan E90 Base Sound System - Creative Audio