Hey guys. When i bought my GT it already had an aftermarket Alpine head unit and has no bass. Anyways, i pulled the unit and saw that the guy never used a wiring harness to hook it up and simply hardwired the Alpine into the stock harness. My question is can i still buy this Scosche OEM Amplifier adapter ( http://www.crutchfield.com/S-Vvwv17DgOHG/cgi-bin/prodview.asp?i=142C4FDK5 ) and use it to integrate my amps into my speakers/aftermarket head unit or is that no longer possible since he cut the factory harness and hardwired instead of using a simple harness? Thanks