go to best buy. the part u need is a line out converter. 25.99, plus tax. u might as well have them install the entire system, because from reading your past posts... this may be a bit past your average "shade tree" installers skill level.

at best buy

amp install 69.99 (labor)
amp kit 70.99 (wiring, they'll want to start over with theirs)
converter 25.99 (converter for factory radio)
conv.
install 16.99 (labor for wiring the part to the factory radio)
______
total: less than $200

trust me, it's worth it.

 

yea i'd have somebody install it too, but you can also run the line converter off one of your rear speakers in the trunk, saving you the cable eneeded to run it from the headunit. and off a factory headunit its going to sound the same wherever you add a line converter.

 

true, true... but later on when u decide to add an aftermarket deck, it sure would be nice to have your connections already behind the radio.

 

some amps come with high level inputs so you can run wires straight off your stereo to the amp, if that's the case then splice a wire into the ones coming out of your deck that drive the rear speakers, while you're back there run your RCA cables at the same time to allow for the future upgrade, that way you've got everything in place to upgrade the deck and hook up the amp properly