Originally Posted by StockTalon
You would need to find a sub that requires the volume that the factory enclosure provides. If you don't, it will be a waste of money.
yes this is true.. might not be entirely a "waste of money" but it would get the most benefit from the proper box/sub combo.
Tha Kraken: http://www.focusfanatics.com/forum/ford-focus-builds-general-showroom/285082-meet-kraken.html