You need a HU with an AUX. input or you can buy my audiocontrol 4.1 eq/line driver which will greatly improve your SQ and has the aux input you need.

Vinny 2000 T-RED CSVT MODS: 18" REV model 2 ST200 struts/Roush springs CTA intake Pipe/K&N Filter Dtec Heatshield Optimized TB True Duals w/ magnaflow mufflers/resonators