Alpine SWT-12S4 12" Subwoofer Sub Car Bass Tube Box 1000w peak Focus Mk3 RS also available to answer any

also available to answer any questions that might arise

However due to the large Transit PCD  the Transit Factory studs you may not need to do this

Zunsport Front BLACK FULL LOWER Grille RS type to fit Ford Focus ST 2005-2007

The Pro-Spacer is available in different versions from 5 to 30 mm width

(Will not fit Zetec or Zetec S)

Alpine SWT-12S4 12" Subwoofer Sub Car Bass Tube Box 1000w peak Focus Mk3 RS also available to answer anyALPINE SWT 12S4 12" bass tube With 1000W peak power handling, this ready to use bass reflex subwoofer tube is just the thing for big bass fans. A protective grille ensures that nothing sliding around in the trunk damages the woofer. Speaker System: Bass Reflex Type 12" (30cm) High Performance Subwoofer Peak Power: 1000W RMS Power: 300W Overall Dimensions 324 x 660 mm Frequency Response 28 200Hz Speaker Impedance: 4 ? Sensitivity: 92dB W (1m) Stitched