BMW 1 SERIES F20 F21 HATCH STEALTH SUB SPEAKER ENCLOSURE BOXBASS AUDIO 10 12
10" Subwoofers best advised for stealth application, 12" Is vehicle/trim dependent - ask. Flush mount subwoofer £5. 10" 0.70 cu ft / 12" 1 cu ft + wadding simulates a larger enclosure for deeper bass.