My 2002 WRX with a 1000W Baja amp and 2 12" 300w RMS Hifonics in a Bandpass Enclosure on an old Pioneer deck ive had in every car ive owned. Its not the best system out there by any means but it does its job just fine.
http://www.youtube.com/watch?v=jxDc-SWMHDs
http://www.youtube.com/watch?v=UaGHQ9YxGRg