I'm not yelling at you, but you need to do a search before posting on topics like this,
and this would be best placed in the Car Audio forum. To save you a little time, here's a few links. Read them fully and you'll have more info about this topic than you could ever want.
Aux Audio Input thread <-- this one was on the first page of the Car Audio forum.
Aux Input/Sirius hack <-- do a search and you'll find this one, which leads to...
this one
So there you go. Next time search and you shall find.