Anyone know if I can add a HD Tuner to the stock radio in a 2005 Pontiac G6 GT?

well I bought this, I hope it works. It says it will work for all stereos, stock or aftermarket.

http://www.gooddeals18.com/product/DMHD1000/DIRECTED_DMHD1000_Car_Connect_HD_Radio_Receiver.ht ml

http://static.zoovy.com/img/gooddeals18/W400-H165-Bffffff/D/dmhd1000.jpg