Aftermarket cdplayer in 01 GT w/6disc?

If you by a 1.5 DIN sized aftermarket head unit then it should fit fine.. If youre going with standard sized head unit then you will need to either make your own or buy a dash installation kit to make it look good!

You shouldnt need to get rid of the factory amps unless you are going to install other amps and want to save the weight.

If you are going to hook your aftermarket head unit into the factory amp system then you will have to by the adapter. Scosche makes one..But I have discovered that the factory head unit sounds better with the factory system than an expensive aftermarket head unit sounds through the factory system!