I wired it to my car stereo. I installed a Pioneer receiver and the aux input adapter and plugged one of those audio input to miniplug cables into it. Then use sik imp for the line out and car charger adapter. The sound is a lot better than through those casette adapters.
I didn't have to buy a new receiver, but I didn't want to fool with cd changer to aux input adapters for my stock headunit and I wanted a new receiver anyways.
Here's a link to a thread at ipodlounge about everything for hooking an ipod up to a car -
http://www.ipodlounge.com/forums/sho...threadid=31503