how would i go about adding a amplifier and subwoofer to the factory deck(single cd). would it be a pain in the a** to do so.

on a tight budget so sticking with it for now, but maybe down the road a year or two, might get a new Head Unit.

adding a MTX: X300DP Amplifier, thunder series
and a MTX: MZS1004 Subwoofer

You would need an RC adapter so you will be able to hook it up with your amp. It would sound allot better if you just get after market head unit, but yeah just go to any audio store and ask for the adapter. O yeah you also might need to sawyer some wires as well.

ive made my mind to go with a after market deck, but will i now need to a get a wire harness so that i can connect the wires or will it just connect in straight. the original deck is a single cd without evic.