Custom Fibreglass 10″ Underfloor Subwoofer Box To Suit BMW E90 E91 E92 E93 3 Series

Stealth Bass Upgrade for BMW 3 Series (E90, E91, E92, E93)

This fibreglass subwoofer enclosure is custom-moulded to fit in the underfloor storage compartment of the BMW 3 Series. Designed for a 10-inch subwoofer, it delivers deep, powerful bass while keeping your boot space clean and practical with a near factory look.

Features:

• Suits 10-inch subwoofers up to 150 mm deep
• Precision fibreglass construction – durable, lightweight, and resonance-free
• Designed for the underfloor storage compartment
• Internal volume: ~XX litres (spec to confirm)
• 10″ cutout (~250 mm)
• OEM-style fit – stealth install while retaining usable boot space
• Subwoofer not included – enclosure only

Compatibility:

• BMW 3 Series E90 Sedan (2005–2012)
• BMW 3 Series E91 Touring/Wagon (2005–2012)
• BMW 3 Series E92 Coupe (2006–2013)
• BMW 3 Series E93 Convertible (2007–2013)

Unlike universal MDF sub boxes, this tailored fibreglass enclosure is engineered for your BMW 3 Series. It delivers clean, powerful bass while maintaining a discreet, OEM appearance—perfect for drivers who want high-end sound without sacrificing space.