Description Stealth Bass Upgrade for BMW 3 & 4 Series This custom-moulded fibreglass subwoofer enclosure is designed to fit seamlessly in the underfloor storage compartment of BMW F30 Sedan, F31 Touring, and F32 Coupe (2012 onward). By utilising the hidden space beneath the boot floor, you can add a full-size 10-inch subwoofer without sacrificing valuable boot space or factory styling. Features: Suits 10-inch subwoofers up to 160 mm deep Precision fibreglass construction – rigid, durable, and resonance-free Stealth installation – hidden under the boot floor for a true OEM look Maintains full use of boot space – perfect for daily practicality Approximate internal volume: XX litres (I can estimate this if you want exact spec) Cutout: ~280 mm (standard 10″) Subwoofer not included – box only Compatibility: BMW F30 Sedan (2012 onward) BMW F31 Touring (2012 onward) BMW F32 Coupe (2013 onward) Unlike universal enclosures, this underfloor box is tailored to BMW’s boot design. It drops neatly into the spare wheel/storage cavity, giving you deep, punchy bass without losing practicality. Perfect for anyone who wants high-quality sound in a daily driver while keeping the boot clean and factory-looking.
