wow that has to be close to one of the most unintelligent things ive heard in all my days..

congratz.. but anyways u can hook it up to ur factory reciever but about the factory amp..
1) the amp is connected to the speakers

, thus enableing u to get that good sound..
2) if u take it off those speakers to attach to an amp you will A) lose the great sound and B) the amp is WAY underpowered for any sub or speaker 10", plus going on that i doubt you could hook it up
3) u will definatly need a different amp and A) u have to give us a wattage.. or brand type or model or something.. u cant just put watts to a speaker/sub and think its alright.. (very noobish)
4) if u didnt know that by now u dont deserve to put any audio equipment in your car..
not a very good first impression..... but fill us in with what tpye of subs so we can give an accurate setup for u..