The factory sub is held in place by two screws (7mm head), one by the corner of the dash and one that goes to the bracket on the HVAC plenum/heater core cover. When installing or removing it helps to pull the passenger side dash speaker to gain access to the top of the sub enclosure... it really is a tight fit to get the enclosure in/out. As far as disconnecting the sub has a 2 wire lead tha truns towards the radio/center pod and there is a connector about half way between the sub enclosure and the radio where it can be disconnected.
Rich
[This message has been edited by Richjk21 (edited 04-27-2008).]