Audio Systems: Sub woofer add on, rca jacks, factory radio

Question
I have a 2001 Olds Intrigue With a factory bose stereo system.  I would like to add an additional amp and subwoofer using the factory radio but i need rca jacks what can I do?

Answer
Many systems are available that can be added on (like Bazooka's), but the best way to generally deal with interfacing to the existing system is probably going to be found at http://www.crutchfield.com

In fact, they will assist you (and your specific vehicle) all the way through it.