Hi. I'm looking to install a subwoofer and amplifier on the 2005 F-250 supercab but I need to keep the factory radio for now due to finances. I have the amp from a previous vehicle that I would like to install. I'll need a line converter to change over the RCA cables from the factory wiring. I'm looking to buy Soundgate converters because they look very nice. Soundgate makes one for systems with factory amps and one for those without. Does anybody know if there is a factory amp on these systems? I have the 6 disc in-dash changer. I'd like to order everything prior to ripping apart my truck. Thanks in advance!